After the conquest by Jaume I, the lands of the Serra were shared out amongst the king, his knights and the Church, and new forms of territorial organization were established. To defend the island against possible attacks by Arabs, the Christians established a network of towers, lookout posts and castles. This was how the most important fortifications were consolidated - Castell de Rei (Pollença) and Castell d’Alaró, rocky castles set in key defensive positions which already existed during Roman times, and which the Muslims had turned into fortresses.

Centuries later these castles were used by the followers of King Jaume III of Mallorca to defend themselves from the invasion by Pedro IV of Aragon which led to the reintegration of the independent kingdom of Mallorca into the Catalan-Aragonese confederation.