Castle of Pelegrina is a 12th-century fortress in Sigüenza, Guadalajara, built directly atop rock to control the strategic Dulce River canyon and the main route connecting medieval Spain. Originally held by the bishops of Sigüenza, the castle changed hands repeatedly throughout history—seized by King Pedro I during his conflict with Aragón, later sacked by Navarrese forces in the 15th century, and eventually reclaimed by diocesan authorities. Its elevated position dominates not only the Pelegrina valley but also the meseta plains extending toward the Roman road of Emérita Augusta, now the modern A2 highway. The fortress was formally declared a Cultural Heritage Site in 1949.
