During the Roman period, it seems the island was connected to the continent at low tide. It took its current shape around 1500. In 1067,
Isembert de Châtelaillon gave the island to the order of
Cluny. A small convent was established, which depended on St Martin in
Île de Ré. At the end of the 12th century, France and England fought for the possession of the island. Until 1286, the island was located at the boundary between the French and the English
Saintonge, formed by the estuary of the river
Charente. During the
Hundred Years War, the island became English for about 15 years. In the 16th century, during the
French Wars of Religion, the island became
Catholic and then
Protestant. In 1665, nearby
Rochefort was established as a strategic harbour for the Kingdom, leading to the construction of many fortifications in the area.
Vauban built numerous fortifications on the island, which Ferry completed in 1704. During the
Seven Years' War (1756–1763), the British captured the island in 1757 and destroyed its ramparts as part of the attempted
Raid on Rochefort, before withdrawing several weeks later. The island was again captured by British forces in 1759 following the
Battle of Quiberon Bay and occupied until the end of the war in 1763. The fortifications were then rebuilt by several French officers, including
Marc René, marquis de Montalembert and
Pierre Choderlos de Laclos, the author of
Les Liaisons dangereuses. During the
French Revolution, in 1794, the island was used as a prison for the suppression of religious opponents in which
hundreds of priests were left to die in moored
prison-boats. About 226 were buried in the sands of Île-d'Aix.
Napoleonic period Napoleon famously visited the island in 1808 and gave directions to reinforce the fortifications. He ordered the construction of a house for the commander of the stronghold (today's
Musée Napoléon) and the construction of Fort Liedot, named after a colonel killed in the
Russian campaign. In 1809, the
Battle of the Basque Roads (French: ''Bataille de l'Île d'Aix'') was a
naval battle off the island of Aix between the
Royal Navy and the Atlantic Fleet of the
French Navy. On the night of 11 April 1809, Captain
Thomas Cochrane led a British
fireship attack against a squadron of French warships anchored in the
Basque Roads. In the attack, all but two of the French ships were driven ashore. The subsequent engagement lasted three days but failed to completely destroy the French fleet. From 12 to 15 July 1815, after the defeat at
Waterloo,
Napoleon spent his last days in France at Île d'Aix, in an attempt to slip past a Royal Navy blockade and escape to North America. Realising the impossibility of accomplishing his plan, he wrote a letter to the British regentContent of the letter: {{Blockquote|text= Your royal highness, confronted with the various factions that divide my country, and with the enmity of the greatest nations of Europe, my political career has come to an end, and here I come, like
Themistocles, to sit at the hearth of the British people. I put myself under the protection of its laws, which I request to your royal highness, the most powerful, the most constant, and the most generous of my enemies. Ile d'Aix, 13 July 1815. File:Basques Road-Thomas Whitcombe-217057.JPG|The
Battle of the Basque Roads, April 1809. File:Napoleon on Board the Bellerophon - Sir William Quiller Orchardson.jpg|Napoleon on
HMS Bellerophon after his 1815 surrender. ==Population==