From the 14th century until the French Revolution, it was the headquarters of the Parlement of Paris. During the Revolution it served as a courthouse and prison, where Marie Antoinette and other prisoners were held and tried by the Revolutionary Tribunal.
Since the early 1800s it has been the seat of the Tribunal de grande instance de Paris, the Court of Appeal of Paris, and the Court of Cassation. The first of these moved to another Parisian location in 2018, while the other two jurisdictions remain located in the Palais de la Cité as of 2022.
The palace was built and rebuilt many times over the course of many centuries, including following major fires in 1618, 1776 and 1871.
Its salient medieval remains are the Sainte-Chapelle, a masterpiece of Gothic architecture, and the Conciergerie, an early-14th-century palatial complex that served as a prison from 1380 to 1914.
Most of its other current structures were rebuilt from the late 18th to early 20th centuries. The Conciergerie and Sainte-Chapelle can be visited via separate entrances.
History
Archeological excavations have found traces of human habitation on the Île de la Cité from 5000 BC until the beginning of the Iron Age, but no evidence that the Celtic inhabitants, the Parisii, used the island as their capital.
Julius Caesar recorded meeting with the leaders of the Parisii and other Celtic tribes on the island in 53 B.C., but no archeological evidence of the Parisii has been found there.
However, after the Romans conquered the Parisii in the first century BC, the island was developed quickly. While the forum and largest part of the Roman town, called Lutetia, was on the left bank, a large temple was located on the east end of the island, where the Cathedral of Notre Dame de Paris is found today.
The west end of the island was residential, and was the site of the palace of the Roman prefects, or governors. The palace was a Gallo-Roman fortress surrounded by ramparts. In the year 360 AD, the Roman prefect Julian the Apostate was declared Emperor of Rome by his soldiers while he was resident in the city.
Beginning in the 6th century, the Merovingian kings used the palace as their residence when they were in Paris. Clovis, the King of the Franks, lived in the palace from 508 until his death in 511.
The Kings who followed him, the Carolingians, moved their capital to the eastern part of their empire, and paid little attention to Paris. At the end of the 9th century, after a series of invasions by the Vikings threatened the city, King Charles the Bald had the walls rebuilt and strengthened.
Hugh Capet (941-996), the Count of Paris, was elected King of the French on 3 July 987, and resided in the fortress when he was in Paris, but he and the other Capetian kings spent little time in the city, and had other royal residences in Vincennes, Compiègne and Orleans. The administration and archives of the kingdom travelled wherever the king went.