
Castillo de Embid, dating to the first half of the 12th century, served as a critical strategic fortress along the medieval frontier between Castile and Aragon in Guadalajara's Castile-La Mancha region. Built on the orders of Alfonso XI's servant Diego Ordoñez, this pentagonal fortress features three cylindrical crenellated towers connected by substantial wall sections that remain standing today. The castle was destroyed during Pedro I's reign, reconstructed in the 15th century by the notable Juan Ruiz de Molina (known as the Old Knight), and further damaged during the War of Succession. Modern visitors can explore the ruins through guided visits conducted by volunteer personnel, offering insight into this important medieval defensive complex.