Montesquiu Castle possibly has its origins in the enclave of a guard tower that Count Guifré I (El Pilós) had built in the 9th century. It is not until the middle of the 14th century, however, when the current castle goes from being a small house intended for defense to becoming a fortified residence. Arnau Guillem de Besora is the first of his lineage to live in the castle.
In the 17th century, Lluís Descatllar, despite residing in Barcelona, expanded and ennobled the house. He is responsible for the construction of the current chapel and the expansion of the North-East sector, in addition to other actions that meant an important change in the overall image of the building. At the beginning of the 20th century, Emili Juncadella, a representative figure of the high bourgeoisie of the time, gave the old manor the appearance of a castle it has today and completed it with gardens. But Juncadella's reform hides many vestiges of the building's previous evolution and expansions.
Currently, and after an intervention that has preserved the most significant architectural evidence from the various periods, the castle has recovered its link with the territory and has been integrated into the park as a whole.