There are more than 1,400 items.  Just click on a range of years, like 1450-1499, and the Timeline will come up, showing three items with directional arrows to move forward or back to more items.

A PDF of the entire Trans-Atlantic Timeline is also available, free.  It’s 106,000 words, or 287 pages single-spaced as of Nov. 8, 2024.  It’s the most up-to-date version of this project.

Gold, Sugar, Ships… and People

A Trans-Atlantic Timeline, 1400-1900

Before 1400

1238
Muslims Surrender Valencia
A Christian army under Jaime I, who has already taken the Balearic Islands, captures Valencia from Moorish rulers, completing the kingdom of Aragon’s portion of the Reconquista of Iberia (al-Andalus to the Arabs).
     Most of central and southern Iberia (present-day Spain and Portugal) had been under Muslim rule since the invasion of 711-716 and defeat of a Christian Visigoth king by a Berber army sent by the Arab Umayyad Caliphate. 
     Maure, Moors and Berbers: Peoples who today call themselves the Amazigh still live in western North Africa (largely present-day Morocco and northwest Algeria). One of their ancient tribes were the Maure and “Mauretania” was applied to a kingdom between the Atlas mountains and the Mediterranean, a name Romans kept when making it a province. The Amazigh were overwhelmed by the Umayyad conquest of the late 7th century, converted to Islam and dubbed “Berbers” by the Arabs. Iberian Christians continued to identify Amazigh people as “Maure,” which evolved into “Moors.” Christians soon extended that to apply to Arabs as well and, through centuries of conflict, to other Muslims.
     The term “Saracen” was also applied by Christians to Arab Muslims, particularly toward the Holy Land, and less often to Turkish Muslims; the latter were rarely referred to as “Moors.”

1244
Crusaders Vanquished
Jerusalem, briefly won by the Sixth Crusade (the First Crusade was launched 150 years earlier), falls to mercenary Central Asian horsemen who sack the city and massacre much of the population, August. Crusaders, mainly Franks, lose again at Battle of La Forbie, October, to Egyptian Mamluks, despite having an ally in the Muslim Ayyubid sultan. More than 5,000 Crusaders die, including virtually all of the knightly orders.
Several more Crusades will follow, and Christian-Muslim wars will continue from one end of the Mediterranean to the other for centuries, but Christian power is never restored to the Holy Land.

1249
Portugal Ends Muslim Rule
Portuguese, under King Afonso III, capture Faro, the last Muslim stronghold in the Algarve, completing the Christian reconquest of Portugal.
This leaves only the Emirate of Granada as a Muslim bastion in Iberia. For the next 240 years, that emirate will alternate between bloody warfare with Castile and paying vassal tribute with African gold, while maintaining its Muslim identity and self-rule.
It won’t be until 1492, under Isabella and Fernando, that Castile completes the Reconquista of the entire peninsula with the surrender of Granada’s last emir.

1260
Mongols Turned Back
An army of Egyptian Mamluks stops Mongol forces in Syria after the latter have conquered Persia, destroyed Baghdad and ended the Abbasid Caliphate in Damascus.
It’s the high-water mark of Mongol expansion across Asia that began with Genghis Khan early in the century.

1291
Into the Atlantic
Brothers Ugolino and Vandino Vivaldi set out from Genoa in May with two galleys to attempt a voyage into the Atlantic and around Africa to India. They are believed to have reached Cape Nun (in present-day Morocco), according to an annal of the day. But they and their crews are never heard from again.
It is believed to be the first European attempt since Roman times to explore far beyond the Strait of Gibraltar.

1298
Marco Polo’s Asian Adventures
Livres des Merveilles du Monde, better known as The Travels of Marco Polo, appears in Italy describing Polo’s Silk Road journey to Cathay (China), long service to Kublai Kahn, the Mongol emperor, and return with his father and uncle to Venice after 24 years in Asia (1271-1295).
The book introduces an amazed Europe to Asia in detail, and inspires generations to venture to central and eastern Asia, not least Christopher Columbus who filled his copy with handwritten notes.

1312
The Canaries Rediscovered
Lancelotto Malocello, also a Genoese, ventures into the Atlantic, possibly in search of the Vivaldi brothers. If so, he does not find them, but does encounter the northernmost Canary island, which will be named Lanzarote for him.
This is a rediscovery, for the Canaries were known to the Phoenicians, Carthaginians and Romans (Pliney the Elder wrote that they were named for packs of large dogs on Gran Canaria).
The islands, which begin 62 miles off Cape Juby (well south of Cape Nun), are inhabited by the Guanche people who probably arrived in the first millennium BC. Genetically, they share ancestry with the Berbers of North Africa; they also use a script similar to the Berbers’ Numidian script.
Malocello builds a stone fort and lives in relative peace with the Guanche until they expel him around 1332.

1315-1317
Famine in Northern Europe
Constant rainy weather in the spring of 1315 leads to crop failures; cattle disease kills as much as 80% of cattle and sheep. A severe winter and another cold spring follow. Peasants eat their seed grain, slaughter work animals, even abandon children. Pneumonia and tuberculosis overwhelm the starving. Millions die, more than 10% of the population of northern France, southern England and the Low Countries.
Crime and violence surge, war is waged far more brutally. Confidence in the church and in kings plummets. Three centuries of population growth end, with no recovery before 1322. And worse is to come with the Black Death.

1341
Exploring Gran Canaria
Nicoloso da Recco, yet another Genoese, leads an expedition to Gran Canaria on behalf of Portugal’s King Afonso IV. Da Recco studies the Guanche and their language and maps more of the island chain.
In 1350, priests from Majorca establish a mission, probably on Gran Canaria, that co-exists with Guanche until 1400 at least.

1347
Plague Sweeps into Europe
Now believed to have originated in present-day Kyrgyzstan in late 1330s, the Black Death sweeps across Asia, north Africa and Europe, killing as many millions by 1351, history’s most deadly pandemic.
First noted in Crimea, it is brought to Messina, Sicily, by Genoese galleys manned by dying sailors in October. In Europe, as many as 20 million people die, perhaps a third of the continent’s population, previously reduced by famine. London, Paris, Florence suffer death rates of 50% to 60%, with mass burials.
Jews are frequently, hysterically accused of poisoning wells; thousands are massacred in Strasbourg, Frankfurt, Mainz and Cologne, and many thousands more flee to the welcoming arms of Poland’s Casimir III.
Cause: The Yersinia pestis bacterium is harbored in rats. Fleas feeding on rats spread the bacterium to humans by their bite. Large, dark “bubos” bulge from the lymph system, followed by fever, vomiting, diarrhea and significant pain. The human immune system is overwhelmed; death comes within hours in the medieval outbreak. People also spread the bacterium by coughing and wheezing (pneumonic plague). None of the science is understood at the time.

1350
Black Death at Gibraltar
The plague kills Castile’s Alfonso XI and much of his army, forcing them to lift siege of Gibraltar, a factor in delaying final Reconquista for more than 140 years.
Gibraltar: Name is derived from Jabal Ṭāriq (“Mountain of Ṭāriq”). Ṭāriq ibn Ziyād was the Arab name for the Berber commander who launched the Muslim conquest of Iberia when his army landed nearby in 711.

1394
Portugal’s ‘Navigator’ Born
Prince Henrique is born in Porto, March 4. He is the third son of King João I and Philippa of Lancaster, a granddaughter of England’s Edward III. Henrique, to become known in English as Henry the Navigator, will direct Portugal’s Atlantic explorations for decades.

1390s
A Better Sugar Press
New, improved sugar press doubles volume of juice squeezed from cane, bringing down sugar’s very high price, previously equal to expensive spices from the East. 
Refining of sugar cane
into syrup and granules was developed in India 2,000 years ago. Sugar was introduced to Europe by Arab and Venetian traders, and by early Crusaders. In the Mediterranean, it was first cultivated by Muslims on Cyprus in the 10th century, and then on Sicily and in Andalusia. Slaves from the Black Sea were brought to Cyprus for the work.
Before sugar, honey was the only sweetener available to most peoples.

1400

1402
Europeans Seize a Canary
Lanzarote is the first Canary island to be taken and held by a European expedition, in this case led by Jean de Béthencourt and Gadifer de la Salle, Frenchmen, nominally on behalf of Henrique III of Castile. Followed by conquest of the islands of Fuerteventura and El Hierro, 1405, with some Guanche natives sold as slaves.

1415
Ceuta and Gold
Portugal’s young Prince Henrique leads siege and seizure of Ceuta (Moroccan coast, opposite Gibraltar) to stop Muslim raids on Portuguese coast villages; pirates would hold Christian captives for ransom or sell them into slavery.
Henrique’s later explorations from his base at Lagos are spurred in part by religious fervor to connect with Christian empire led by the mythical Prester John in the East and to ally with him to defeat Muslims.
But equally important is Henrique’s curiosity about trans-Saharan camel caravans that bring gold, ivory and black slaves to Morocco. (The most important return product is rock salt from Saharan mines, essential for preserving food.)
It is the gold, recovered from the streams and estuaries of what becomes  known as the Gold Coast (today’s Ghana) at a rate later estimated to be as much as two tons annually, that most excites the Portuguese.

1417
Financing the Navigators
Henrique is named grandmaster of Order of Christ (the Templars before 1312) by pope at request of Henrique’s father, João I. The Order is then granted sovereign rights and a percent of revenue (including slave revenue) from new discoveries and thus develops into financial engine for Henrique’s explorations.
He expands the systematic study and record-keeping of Atlantic winds and currents that will guarantee Portugal’s lead in ocean exploration for at least 200 years.

1419
Madeira Discovered
Madeira’s smaller, neighbor island of Porto Santo visited by João Gonçalves Zarco and Tristão Vaz Teixeira, two of Henrique’s captains, when they are blown off course. Settlement of uninhabited Madeira (660 miles southwest of Lisbon) begins in 1420.
Much of the laurasilva (laurel forest) is burned off to make way for agriculture. Later, Henrique experiments with vineyards and sugar cane from Sicily. Early slaves are probably North African Moors (either Berber or Arab) seized by the Portuguese in war.

1430s
Caravels Set Sail
Caravels are developed by Henrique, based on Portuguese fishing barcas, which in turn are based on medieval Arab qarib. Lateen sails allow ships to sail into the wind. Some also carry square sails for faster travel before the wind. They are light, displacing only 50-160 tons, and of shallow draft with two or three masts.
Carracks (nauses), developed soon after, are able to carry much more cargo, and often exceed 1,000 tons, with two square-rigged masts and a lateen mizzenmast.

1432
Portuguese Gain Azores
Led by Gonçalo Velho Cabral, Portuguese land on Santa Maria in the uninhabited, mid-Atlantic Azores, 850 miles west of Lisbon. An earlier “rediscovery” of Azores was reported by Diogo de Silves around 1427. Some 14th-century maps appear to include islands but without explanation of their discovery.
São Miguel, Terceira, Faial and Pico are settled by 1440. Last of the nine main islands (which stretch west more than 370 miles) to be discovered are Corvo and Flores in 1452.
Most Azores settlers are peasants from the Algarve and Alentejo, including a number of Jews. Another contingent comes from Flanders. All work on land granted by Henrique to donatarios (usually his captains, Cabral is the first) who have full governor powers. Early use of slaves ends due to settlers’ fear of insurrections. A tenant-farming system develops instead.

1434
Canary Enslavement Condemned
Pope Eugene IV orders excommunication of any person who enslaves any Guanche newly converted to Christianity on the Canary Islands, where Portuguese, particularly, conduct slave raids. In 1435, pope orders wrongly enslaved Christians to be freed within 15 days. But enslavement of non-baptized Guanche is protected under a third bull issued the following year.

1434
Rounding Cape Bojador
Portugal’s Gil Eanes is first to round Africa’s Cape Bojador, due south of Canaries’ Fuerteventura, after many failures and wrecks. Bojador is long feared for tricky northeast winds, extended reefs and insistent southerly coastal current. Also feared for sea monsters beyond.

1437
Portugal Stopped at Tangier
Portuguese, led by Henrique, besiege Tangier. But his army is in turn encircled by Moroccans and forced to surrender. Henrique promises to return Ceuta to Moroccans if he can keep his army, minus hostages who include his younger brother Fernão.
When Henrique’s offer to take Ferdinand’s place is denied by King Duarte (older brother of Henrique and Fernão), Henrique and ministers renege on return of Ceuta; Duarte dies of plague soon after; Fernão dies in captivity, 1443.

1441
Slave Trade Beginnings
Portuguese captains Antão Gonçalves and Nuno Tristão, sailing in early caravels, capture 12 persons identified as “Moors” at Cape Blanc (present-day Mauritania) and take them to Lagos as slaves. They are Muslims, probably of Berber origin. Cited as the beginning of West Africa-Europe slave trade.

1444
More Slaves to Lagos
First large group of non-Mediterranean African slaves brought to Europe.
Lançarote de Freitas, the Lagos port collector, wins Henrique’s permission to follow up on Gonçalves-Tristão expedition. With six ships and relatively few men, he rounds Cape Blanc and raids two islands in Bay of Arguin. Some 235 people (again, probably Muslim Berbers) are taken as slaves to Lagos; Henrique’s share is 46 slaves which he distributes among captains.

1445
Rounding Cape Verde
Dinis Dias is the first Portuguese captain to round Cape Verde (at present-day Dakar), 500 miles south of Cape Blanc. Takes four captives, possibly non-Muslim black people.
It will turn out that Cape Verde is the westernmost point of the entire African continent. Also, Dias is too close to mainland to spot the Cape Verde Islands, another 350 miles to the west.

1445
Early Slave ‘Factory’
De Freitas, accompanied by Dias, returns to Bay of Arguin with 14 ships, and manages to capture 125 “Moors” and to set up the first permanent European post on Arguin island. Within 10 years, this feitoria (factory) is sending 800 slaves annually to Lagos.
But when De Freitas ventures south to Senegal river, he is rebuffed by fierce black Wolof villagers.

1446
Henrique Suspends Explorations
Explorations Nuno Tristão ventures on his fourth voyage, but is ambushed and killed somewhere between Cape Verde and the Gambia river. When a succeeding expedition led by Álvaro Fernandes provokes more hostilities, Henrique suspends explorations along West African coast for more than eight years.

1447
A Canaries Conquistador
In the Canaries, Hernán Peraza the Elder, a Seville noble, arrives on Fuerteventura (his by marriage) to assert his (and Castilian) control of Lanzarote, El Hierro and La Gomera, and to plan conquest of islands still fiercely defended by Guanche: La Palma, Tenerife and Gran Canaria.
When he dies in 1452, his daughter Inéz declares herself “Queen of the Canary Islands.”

Go to Trans-Atlantic Timeline for the pdf of the complete Timeline through to 1900.

Starting Point

The Iberian Reconquista

This Timeline follows the story of the Western Ocean—the Atlantic—through the Ages of Exploration and Revolution, with a special focus on the trans-Atlantic slave trade.

Slavery dates much farther back, of course, long before written history. It’s a human thing to do, apparently, like loving and praying, only more like stealing and killing.

In medieval times, many European lands engaged in slavery of various description even after serfdom emerged as an alternative to organizing labor. Most Muslim and sub-Saharan African states did as well, albeit with varying rules. It turns out that many Native American peoples did, too.

The attention here is on the Atlantic world—Western Europe, West Africa and the Americas—and on the relatively recent history leading up to the 20th century.

The Iberian Reconquista is the arbitrarily chosen starting point, because Portugal would go on to inaugurate the trans-Atlantic slave trade on the African side of the ocean while Spain would be the first European country to enslave Indians and Africans in the New World.

Through the centuries-long reclamation of Iberia (Christian forces took Barcelona, 801; Porto, 866; Toledo, 1085; Lisbon, 1147; Córdoba, 1236; Valencia, 1238; Lagos, 1247; and finally Granada, 1492) it was common practice on both sides to ransom or enslave captives. This was more profitable for the victor and, from the defeated’s point of view, preferable to massacre or execution.

         Examples: An invasion by Alfonso VIII of Castile in 1182 gathered more than 2,000 Muslim slaves. Seven years later, in a raid on Lisbon, the Almohad caliph, Yaqub al-Mansur, took many more thousands of captives, 3,000 of them women and children. Al-Mansur himself was the son of an enslaved African woman given to his father, Yusef.

Slavery Code of the Day: The basic definition of a slave in medieval Europe (as accepted by the Vatican) was little changed from what it had been under Roman and Byzantine law. Specifically, a slave was:

Anyone whose mother was a slave…

Anyone who has been captured in battle…

Anyone who has sold himself to pay a debt…

There were provisions by which a slave could be freed and even become a full citizen. Rules about selling, maintaining, punishing and freeing slaves varied from region to region.

Christian law eventually mandated that Christians could not enslave other Christians, but enslaving non-Christians was acceptable. The Koran spelled out a mirror ban on enslaving fellow Muslims so that, for centuries, the wars between the great religions were fed by each enslaving the other. Both faiths accepted enslavement of Africans who were neither Muslim nor Christian.

A 13th-century code of law, the Siete Partidas issued by Alfonso X of Castile, repeated the old Roman definitions but also specified what constituted good treatment of slaves by their masters.

The Siete Partidas also states that slavery is “the basest and most wretched condition into which anyone could fall because man, who is the freest noble of all God’s creatures, becomes thereby in the power of another, who can do with him what he wishes as with any property, whether living or dead.”  Wretched, but acceptable.

Muslim Slavery in Contrast

There were differences in the Muslim world: Captured Christian Europeans and non-Muslim blacks were equally favored as slaves.  Males were frequently directed into military units, most notably the Black Guard of the Moroccan sultan, Ismail ibn Sharif (most from the sub-Sahara); the Janissaries of the Ottoman sultans (most from the Balkans, and many provided as young men by their Christian villages) who could rise to high ranks; and the Mamluks (from southern Russia and Circassia) who eventually rose to rule Egypt.

The Mediterranean fleets of Muslims and Europeans alike relied on thousands of captives to man the oars of their galleys, the dominant ships of war from Gibraltar to Constantinople well into the 17th century.

After capture in Africa, the survival rate of black slaves was lower on trans-Sahara routes than even across the Atlantic; and no better than Atlantic rates across the Indian Ocean.

Most Muslim societies appear to have granted more rights to slaves than most Christian societies did.  Muslims also appear to have involved slaves more in the overall community, and to have disregarded race as a slave-defining factor (although this was by no means universal).  In many Arab societies, one drop of Arab blood could mean freedom for a slave woman’s children.  (This is the reverse image to the antebellum U.S. South, where any black blood guaranteed servile status, even for those legally free.)  Generally there were more pathways to becoming a freed person under Islam.  Unlike the Bible, in which slavery is rarely mentioned in the Old or New testaments, the Koran is specific regarding how slaves are to be treated, and states that freeing one’s slaves is an act of righteousness.

There were generally more rules to protect slaves from mutilation or death at the hands of masters.  And more willingness among masters to follow those rules.

There were Muslim societies that did enslave other Muslims.  Usually, as in the case of the Sokoto Caliphate, the enslaved Muslims were not considered sufficiently devout and had been captured in jihad.

As in Europe, slavery began in Africa and the Middle East many centuries before the rise of the trans-Atlantic slave trade.  And slavery continued in parts of Muslim Africa and the Middle East into the 20th century.  The total number of slaves taken in the East Africa and Indian Ocean trade, which began centuries earlier and ended later, may have been twice that of the Atlantic trade. 

It’s also worth noting that no serious abolition movements developed in Muslim countries that held slaves, at least not before the 20th century.

Another difference: With exceptions, most Muslim slave buyers favored women over men, in some lands by a two-to-one margin.  Sexual slavery was more openly accepted in many Muslim societies; concubinage was the fate of many women.  And a significant portion of the men were castrated.

Fewer black communities descended from slaves in non-African Muslim areas.  One reason is that slaves were more frequently separated by gender; they did not live in families as they often would in the Americas.

An exception was Ismail ibn Sharif’s Black Guard, mentioned above: The slave soldiers were encouraged to take black wives and assigned a camp at Mechra er-Remel to raise children.   The boys were trained to be soldiers and masons; the girls to be mothers or courtesans.   Descendants of that community live on in Morocco.

Another reason for the lack of sizeable communities of slave descendants:  It was easier in Muslim lands for new generations to pass into the general population, even if their mothers were slaves.

Note on Disease

The recent pandemic demonstrates again that disease plays a huge role in human affairs.  And so it did in the three regions in which the trans-Atlantic slave trade unfolded: Europe, Africa and the Americas.

The famous Black Death (bubonic plague) swept most of Eurasia (as well as North Africa’s Mediterranean coast) from 1346 to 1353.  At least 75 million people died (including up to half the population of Europe), and perhaps as many as 200 million.  Those are the most deaths attributed to a single pandemic, but others since (especially among American natives) proved more deadly in terms of the percentage of population killed.