Founding of the town of Treviño Historical milestone · Condado de Treviño, Ebro, Burgos Image of Condado de Treviño, not of the place itself. King Sancho VI of Navarre founded the town of Treviño in 1161 to secure the frontier; barely forty years later, in 1200, the territory passed into the hands of Alfonso VIII of Castile, the origin of the Burgos enclave that survives today. 1161 Photo: Basotxerri (CC BY-SA 4.0) What to see and do in Condado de Treviño