It was built in the fifteenth century (1410-1446) to accommodate D. Afonso, the future 1st Duke of Bragança, illegitimate son of D. João I, who was married with D.ª Brites, the daughter of D. Nuno Álvares Pereira.
In 1739 the Governor of Arms of Trás-os-Montes, General Francisco da Veiga Cabral, ordered the restoration of the building to install there the Guard barracks and the military prison.
Since 1978, the building lodges the collection of the duke and the Museum of the Flaviense Region ‒ ‘Museu da Região Flaviense’. Apart from the main room, where is the permanent exhibition, there is also a room dedicated to the local painter Nadir Afonso.
RNAAT n.º: 249/ 2023