Île de la Cité (il də la site; English: City Island) is an island in the river Seine in the center of Paris. In the 4th century, it was the site of the fortress of the Roman governor. In 508, Clovis I, the first King of the Franks, established his palace on the island. In the 12th century, it became an important religious center, the home of Notre-Dame cathedral, and the royal chapel of Sainte-Chapelle, as well as the city's first hospital, the Hôtel-Dieu. It is also the site of the city's oldest surviving bridge, the Pont Neuf.
With the departure of the French kings to the Louvre Palace, and then to the Palace of Versailles, the island became France's judicial centre. In 1302, it hosted the first meeting of the Parliament of Paris and was later the site of the trials of aristocrats during the French Revolution. Today, it is the home of the Préfecture de Police, the Palais de Justice, and the Tribunal de commerce de Paris. The Mémorial des Martyrs de la Déportation, a memorial to the 200,000 people deported from Vichy France to Nazi concentration camps during the Second World War, is located at the eastern end of the island. The city's most famous landmark, Notre-Dame de Paris, was badly damaged by a fire in 2019 and is currently closed. It had been hoped that it would reopen in time for the Paris Olympics in summer 2024 but is now expected to remain closed until December 2024. As of 2016, the island's population was 891.
A Gallic settlement, called Lutetia, may have existed on the island since at least the 3rd century BC. The nearby area was inhabited by the Parisii, a small Gallic tribe. The island may have served them as a convenient place to cross the Seine, a base for a flourishing trading network by river, and a place of refuge in times of invasion. However, no significant traces of a settlement earlier than the 1st century AD have been found to date on the island.
The Parisii were famous traders, taking advantage of the trade routes by river throughout Europe.