Castell de Sanaüja crowns a hilltop overlooking the town of Sanaüja in Segarra, Catalonia. This Romanesque and Gothic fortress, dating from the 10th and 17th centuries, played a significant role in medieval Catalonia. The castle was captured by Muslims in 951 and later mentioned in papal records from 1001 regarding its transfer to the Bishop of Urgell. The Sanaüja family, whose lineage includes Rodolphe de Sanaüja, a leader of the Templar Knights, gained prominence in the 12th and 13th centuries. Today, visitors can explore the castle's perimeter and view preserved remains including an 11th-century chapel, a cylindrical tower, and sections of defensive walls that stand as testament to its medieval significance.