The discovery of the relics of Santa Orosia Historical milestone · Yebra de Basa, Alto Gállego, Huesca Image of Yebra de Basa, not of the place itself. According to tradition, an angel revealed to the shepherd Guillén de Guasillo where the remains of the martyr lay; the head stayed in Yebra and the rest of the body in Jaca, the origin of the two pilgrimage festivals still held every 25 June. 25 de junio de 1072 Photo: McBodes (CC BY 3.0) What to see and do in Yebra de Basa