Initially practising Gothic paganism, the Goths were gradually converted to Arianism in the course of the 4th century. According to Basil of Caesarea, a prisoner named Eutychus taken captive in a raid on Cappadocia in 260 preached the gospel to the Goths and was martyred. It was only in the 4th century, as a result of missionary activity by the Gothic bishop Ulfilas, whose grandparents were Cappadocians taken captive in the raids of the 250s, that the Goths were gradually converted. Ulfilas devised a Gothic alphabet and translated the Gothic Bible.