Gothic language, which was performed by a group of translators. Fragments of the Gothic Bible translation have survived, notably the Codex Argenteus held since 1648 in the University Library of Uppsala in Sweden. A parchment page of this Bible was found in 1971 in the Speyer Cathedral. Historical sources There are five primary sources for the study of Ulfilas's life. Two are by Arian authors, three by imperial Church (Nicene Christianity) authors. Arian sources Life of Ulphilas in the Letter of Auxentius Remaining fragments of Historia Ecclesiastica by Philostorgius Nicene Christianity sources Historia Ecclesiastica by Sozomen Historia Ecclesiastica by Socrates Scholasticus Historia Ecclesiastica by Theodoret There are significant differences between the stories presented by the two camps. The Arian sources depict Ulfilas as an Arian from childhood. He was then consecrated as a bishop around 340 and evangelized among the Goths for seven years during the 340s. He then moved to Moesia (within the Roman Empire) under the protection of the Arian Emperor Constantius II. He later attended several councils and engaged in continuing religious debate. His death is dated from 383. The accounts by the Imperial Church historians differ in several details, but the general picture is similar. According to them, Ulfilas was an orthodox Christian for most of his early life and converted to Arianism only around 360 because of political pressure from the pro-Arian ecclesiastical and governmental powers. The sources differ in how much they credit Ulfilas with the conversion of the Goths. Socrates Scholasticus gives Ulfilas a minor role and instead attributes the mass conversion to the Gothic chieftain Fritigern, who adopted Arianism out of gratitude for the military support of the Arian emperor. Sozomen attributes the mass conversion primarily to Ulfilas but also acknowledges the role of Fritigern. For several reasons, modern scholars depend more heavily on the Arian accounts than the Imperial Church accounts. Auxentius was clearly the closest to Ulfilas and so presumably had access to more reliable information. The Nicene accounts differ too widely among themselves to present a unified case. Debate continues as to the best reconstruction of Ulfilas's life. Creed of Ulfilas The Creed of Ulfilas concludes a letter praising him written by his foster son and pupil Auxentius of Durostorum. It distinguishes God the Father ("unbegotten") from God the Son ("only-begotten"), who was begotten before time and created the world, and the Holy Spirit, proceeding from the Father and