The Château de Suscinio is a Breton castle in Sarzeau, in the Morbihan department, near the Atlantic coast. It was built in the late Middle Ages as a residence for the Dukes of Brittany, and its first manor house dates from the early 13th century.
The castle was fortified and enlarged at the end of the 14th century. John V and John VI added a new residence block and the Tour Neuve, a large corner tower. An artillery casemate followed at the end of the 15th century. From 1471 to 1484 it housed Jasper Tudor, Henry Tudor and their Lancastrian exiles.
After Brittany joined France in 1514 the castle was largely abandoned and used as a quarry. The Department of Morbihan bought it in 1965 and began restoring it. It hosts exhibitions and summer events.
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