[1] It was later remodeled by successive invading forces, including the Alans, Visigoths and the Arabs, although it is unclear when the present castle was established.

The castle of Almourol is one of the more emblematic medieval military monuments of the Reconquista, and one of the best representations of the influence of the Knights Templar in Portugal.

[1] When it was conquered in 1129 by forces loyal to the Portuguese nobility, it was known as Almorolan, and placed in the trust of Gualdim Pais, the master of the Knights Templar in Portugal, who subsequently rebuilt the structure.

In the 19th century, it was "reinvented" by idealistic romanticists, which eventually led to interventions in the 1940s and 1950s and adaptation of the castle to an "Official Residence" of the Portuguese Republic.

[2] The Serviços de Engenharia do Estado Maior do Exército ("Army General Staff Engineering Services") reconstructed a roadway that skirted the islet from the quay to the southern end of the castle.