According to historical tradition, some Germanic tribes migrated to the mouth of the Vistula from Scandinavia. Little is known of Gepidic, Rugian, and Burgundian; some knowledge of Vandalic, Visigothic, and especially Ostrogothic is provided by the names recorded in Greek and Latin writings. The only East Germanic language with extensive information is Gothic, specifically Visigothic, spoken along the western shore of the Black Sea in the middle of the 4th century CE. Knowledge of Gothic is primarily derived from a Bible translation made for the Visigoths living along the lower Danube by Ulfilas, a Visigothic bishop of the Arian church in the 4th century.