Castell de Morella is a fortress situated at the summit of the town of Morella, in the Els Ports region, province of Castellón, with origins dating back to the third millennium BC. The hill upon which it stands was already fortified and inhabited by Iberians and Romans before the Almoravids and Almohads gave it its character as an impregnable castle. It was precisely the Almohads who, from 1175 onwards, transformed Morella into a stable city, with a population dedicated mainly to livestock and trade, taking advantage of its position as a passage between the interior and the coast.

The definitive Christian conquest was carried out by Blasco de Alagón in the autumn of 1232, and he was the one who granted the charter of population 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 on two occasions by El Cid before his assault on Valencia. In the fifteenth century, reforms were undertaken on the most deteriorated parts and prisons were set up that came to house figures such as the Countess of Urgell and the Prince of Viana.

The castle stands in the most irregular part of the rocky hillock at 1,072 metres in height, dominating the town and the surrounding mountainous landscape. It was declared a Historic-Artistic Monument in 1931, a category that today is equivalent to being listed as a Cultural Heritage Asset (BIC). The fortress has been one of the most important defensive positions in the western Mediterranean and constitutes material testimony to the passage of multiple civilisations throughout history.