Saint Eurosia (or Orosia) (†714) was a Spanish Martyr who is the patron saint of Jaca, a city in northeastern Spain, the center of her cult. Tradition states that she was born in Bayonne (or perhaps Bohemia) and was martyred by the Moors at Jaca. According to tradition, she was of noble birth and promised to a Moor in an arranged marriage. Eurosia escaped and hid in a cave. Unfortunately, the smoke from her fire led to her capture. She was dragged from the cave by her hair and martyred. A shepherd of Yebra de Basa is said to have discovered her relics in the 11th century thanks to an apparition of the Virgin Mary that identified their resting place. Her head remained at the original simple shrine, while Sancho Ramírez, recognizing the importance of Eurosia's relics, brought her body to Jaca, which he had designated the capital of his kingdom of Aragon. Drawing pilgrims to his city, he shifted the traditional route of the Way of St. James, which had followed the Roman military route of the Puerto del Palo by the Monastery of San Pedro de Siresa to Berdún. He established a route through Somport and Jaca, to bring traffic through his city, reinforced by publicized miracles at the urban shrine that was now on the direct route of the Camino de Santiago. Her cult spread throughout Béarn and northern Italy thanks to the subsequent campaigns of the Spanish realm in those regions. In Spain, the "Fiesta de Santa Orosia" is celebrated on 25 June and she is considered to be a Patron saint of demonically possessed.