 In 1971, a Roman tombstone fragment was found in Castillejo and has been preserved in the Museum of Prehistoric Valencia.The area was captured in 1210 by Peter II of Aragon, recovered by Muslims shortly afterwards, and captured in the Reconquista by James I. Castielfabib, along with Ademuz, became part of the Kingdom of Valencia, and held in the royal domain under direct control of the crown.In 1304, the village was used as collateral for a loan from the Knights Templar.