After having been occupied by the Gauls and the Romans, Nantes was Christianised in the 3rd century. The city was successively invaded by the Saxons (around 285), the Franks (around 500), the Britons (in the 6th and 7th centuries) and the Normans, who laid waste to it in 843: "The city of Nantes remained for many years deserted, devastated and overgrown with briars and thorns." The Chronicle of Nantes continues until about 1050 and it recounts that Alain Barbe-Torte, who was the grandson of Alan the Great, the last king of Brittany who was expelled by the Norse, drove them out and founded the Duchy of Brittany.
When the Duchy of Brittany was united to the kingdom of France in 1532 by the Treaty of Plessis-Macé, Nantes kept the Parliament of Brittany for a few years before it was moved to Rennes. In 1598, King Henry IV of France signed the Edict of Nantes here, which granted Protestants rights to their religion.
During the 18th century, prior to abolition of slavery, Nantes was the slave trade capital of France.This kind of trade led Nantes to become the largest port in France and a wealthy city. When the French Revolution broke out, Nantes chose to be part of it, although the whole surrounding region soon degenerated into an open civil war against the new republic known as the War in the Vendée. On 29 June 1793 the town was the site of a Republican victory in this war. The Loire was the site of thousands of executions by drowning, including those using the method which came to be known as the Republican marriage, in which a man and a woman were stripped naked, tied together, and thrown into the river.
In the 19th century, Nantes became an industrial city. The first public transport anywhere may have been the omnibus service initiated in Nantes in 1826. It was soon imitated in Paris, London and New York. The first railways were built in 1851 and many industries were created. In 1940, the city was occupied by German troops. In 1941, the