[1] The medieval settlement was founded on a Romanized castro, which was a 2nd century presence conditioned by its position over the Ribeira de Seda, identifiable by milestone encountered in the region, among other vestiges.
As a result, in 1971, the Direcção Geral dos Edifícios e Monumentos Nacionais (DGEMN) began the consolidation of the walls and tower.
[1] The walls and corbels are situated between the vegetable gardens and yards of the Rua do Castelo, while along the east is an abrupt slope, that is part of a derelict farm.
[1][2] Rui de Azevedo who catalogued Seda as a 12th-13th century fortified settlement, indicated that it was not a castle, between 1350 and 1450, from the records of Baquero Moreno.
[1][2][3] Documents from Rui de Pina also indicated that the fortifications of Seda were not identified as a castle in the works of King D.