The Romans probably built the first fortifications at Antibes.
In 1553, a tower called la tour Saint-Florent was built around a preexisting chapel.
Henry III had four bastions added in 1565, whereupon it became Fort Carré (the squared fort).
The construction has been finished 25 years from its beginning.

In the 1680s, Vauban strengthened Fort Carré, adding traverses to protect against ricochet fire and exchanging the stone parapets, which were liable to scatter deadly splinters when hit by shot, for brick ones.
Vauban also enlarged the embrasures and added outer walls to the fortification.

Later, the fort's design was modified to take eighteen cannon.
The entrance to the fort is through a triangular work that protrudes from the walls, and which is loopholed and pierced by a heavy wooden door.
From here, there is a narrow bridge that leads into the fort itself via the flank of one of the arrow-headed bastions.
Inside, there are barrack buildings for officers and men as well as the ancient chapel, which has been preserved through the successive stages of military development of the site.

In addition to improving the defences of Fort Carré, Vauban fortified Antibes itself, adding a land front of four arrow-headed bastions around the town, as well as seaward fortifications, including a bastion on the breakwater closing the harbor.

During the French Revolution, Napoleon Bonaparte was briefly imprisoned here.
In July 1794, after the violent overthrow of Robespierre, General Bonaparte was detained as a Jacobin sympathizer and held in Fort Carré for ten days.
His friend and political ally, Antoine Christophe Saliceti, secured his release.

Then in 1860, the fort played an important role when France annexed Nice.
The Romans probably built the first fortifications at Antibes. In 1553, a tower called la tour Saint-Florent was built around a preexisting chapel. Henry III had four bastions added in 1565, whereupon it became Fort Carré (the squared fort). The construction has been finished 25 years from its beginning. 
In the 1680s, Vauban strengthened Fort Carré, adding traverses to protect against ricochet fire and exchanging the stone parapets, which were liable to scatter deadly splinters when hit by shot, for brick ones. Vauban also enlarged the embrasures and added outer walls to the fortification.
Later, the fort's design was modified to take eighteen cannon. The entrance to the fort is through a triangular work that protrudes from the walls, and which is loopholed and pierced by a heavy wooden door. From here, there is a narrow bridge that leads into the fort itself via the flank of one of the arrow-headed bastions. Inside, there are barrack buildings for officers and men as well as the ancient chapel, which has been preserved through the successive stages of military development of the site.
In addition to improving the defences of Fort Carré, Vauban fortified Antibes itself, adding a land front of four arrow-headed bastions around the town, as well as seaward fortifications, including a bastion on the breakwater closing the harbor.
During the French Revolution, Napoleon Bonaparte was briefly imprisoned here. In July 1794, after the violent overthrow of Robespierre, General Bonaparte was detained as a Jacobin sympathizer and held in Fort Carré for ten days. His friend and political ally, Antoine Christophe Saliceti, secured his release.
Then in 1860, the fort played an important role when France annexed Nice.
Fort Carré