[1] São Mamede de Mogadouro continued to function as signeurial fiefdom of the Templars, which transformed it into a commandery, and subsequently elevated it to priory.

[1] Transiting the region during a trip between Lamego to Vila Real (en route to Bragança), he stopped in Port and visited places along the Trás-os-Montes and Resende (as recorded by Rui de Pina), when he ordered repairs to the site.

Between 1509 and 1510, Duarte D'Armas designed the castle in his Book of Fortresses, which he represented with an elliptical irregular barbican, crowned with merlons, except "a barrier without crenels toppled to the ground and the inside wall", addorsed in the corner by a small rectangular tower.

[1] A new foral was issued in 1512 by D. Manuel (1495–1521), as the Távoras expanded their role in the defense of the Trás-os-Montes Province, until the end of the 17th century (at the time of the Portuguese Restoration War).

[1] But, in the second half of the 18th century, following the tragic fate of the Távoras, and the loss of its defensive role, the castle was gradually abandoned, falling into ruins.

The first major work to repair the site began in 1950 that concentrated on the walls and tower under the direction of the DGMEN Direcção Geral dos Edifícios e Monumentos Nacionais (General-Directorate on Buildings and National Monuments).

[1] As a consequence, the property began to be administered by the Instituto Português do Património Arquitetónico on 1 June 1992, (under Decree 106F/92, Diário da República, Série 1A, 126).

Alongside are the Torre do Relógio (Clock tower of Mogadouro), a palace/residence in ruins, the Chapel of the Misericórdia, pillory and section of the stations of the cross.