The Gothic castle of Alandroal was one of the military constructions during the reign of King D. Denis, dated from several inscriptions and commemorative plaques located within the fortress.

[1] The second plaque recalls the placing of the first cornerstone in 1294, by Lourenço Afonso, 9th Master of the Order of Avis, their founder, located in the western part of the keep tower.

[1][3][4] The construction of the fortification continued until 1298 and were attributed to a Moor, named Galvao, illustrating a distinction between Moorish adversaries of the time and common workers.

[4] Modern projects in 1980 and 1986 also attempted to stabilize the foundation and clear plant infestants that covered the site, in addition to masonry repairs to improve water flow along the walls, merlons and tower near the Church of the Misericórdia.

[4] The decaying structure was placed under the stewardship of the Instituto Português do Património Arquitetónico (IPPR) on 1 June 1992 (Decree 106F/92, Diário da República, Série 1A, 126).