Claudius, Bishop of Turin. Tractatus in Epistola ad Ephesios ; Tractatus in Epistola ad Philippenses, 2014 title page (Claudii Taurinensis) page v (Claudius; born circa 780; died in 827 or 828; born in Spain; served as theologian at the court of Louis the Pious and was later bishop of Turin)
Diccionario de historia eclesiástica de España, 1972 (Claudio de Turín; died 827)
Enciclopedia italiana (Claudio di Torino; born 8th century; died a few years after 823)
Italiani, G. La tradizione esegetica nel commento ai Re di Claudio di Torino, 1979 page 9 (Spaniard; bishop of Turin) page 11 (Claudius von Turin; Claude de Turin)
LC manual cat. (hdg.: Claudius, bp. of Turin, d. ca. 830)
New Catholic encyclopedia, 1981 volume 3, page 921, etc. (Claudius of Turin; bishop and exegete; born probably near Seo de Urgel, Spain; died toward end of 827, Turin, Italy; Claudio de Turín)