Morella Castle is a fortress situated atop the town of Morella, in the region of Els Ports, in the province of Castellón, with origins dating back to the third millennium BC. The hill on which it stands was already fortified and inhabited by the Iberians and Romans before the Almoravids and Almohads transformed it into an impregnable castle. It was the Almohads who, from 1175 onwards, turned Morella into a thriving town, with a population mainly engaged in livestock farming and trade, taking advantage of its strategic position as a gateway between the interior and the coast.

The final Christian conquest was carried out by Blasco de Alagón in the autumn of 1232; it was he who granted the town charter the following year and held the lordship until his death in 1250, when Morella and its lands passed to the Crown of Aragon. Previously, the castle of Moorish origin had been conquered twice by El Cid before his assault on Valencia. In the 15th century, repairs were carried out on the most dilapidated sections and prisons were established, which came to house figures such as the Countess of Urgell and the Prince of Viana.

The castle stands on the most rugged part of the rocky hill at an altitude of 1,072 metres, overlooking the town and the surrounding mountainous landscape. It was declared a Historic-Artistic Monument in 1931, a category that today corresponds to that of Site of Cultural Interest (BIC). The fortress has been one of the most important defensive positions in the western Mediterranean and stands as a tangible testament to the passage of numerous civilisations throughout history.