John I of Castile
In 1384, Castilian forces take Alenquer, forcing the Master of Aviz, John I of Castile to lay siege to the fortress. After a period, the alcalde, Vasco Pires de Camões surrendered the fortifications, but as a reprisal for the former-alcalde's conspiracy against him, he ordered the removal of the cornerstones of the keep tower and lowered the walls.