Saint Susanna of Rome (†295) was a Christian martyr of the Diocletianic Persecution. She was the daughter of Saint Gabinus of Rome and niece of Pope Caiuson. For her refusal to marry a pagan relative of the Emperor Diocletian, she was arrested as a Christian. At the command of Diocletian, she was beheaded in her father's house, which was later turned by the Christians into a church. The church became known as Sancta Susanna ad duas domos. In addition to her main shrine in Rome, a church exists in Santiago de Compostela dedicated to her; it was first built in the early twelfth century after her relics were translated from Braga to Compostela. Susanna is venerated as the co-patron of the city. Her feast day is on 11 August in the Roman Martyrology, but since 1969 her veneration has been limited to the Church of Santa Susanna in Rome.