The Château-Gaillard is a French hôtel particulier and an archaeological museum, built in the late Middle Ages in Vannes.

[1] Originally built as an administrative building for cardinal Jean de Malestroit,[2] construction of the hotel was completed in 1410.

On September 22, 1914, President of France Raymond Poincaré officially opened the museum's new collections.

[1] The former Hôtel du Parlement de Bretagne is made up of two main buildings with mullioned windows, served by a spiral staircase located in a polygonal stone tower.

This building is decorated with Renaissance paintings and woodwork and a coffered ceiling.