Justus or Just was the fifth bishop of Vienne and lived in the 2nd century. Justus was known also from some spurious letters attributed to Pope Pius I.Johann Lorenz Mosheim, Institutes of ecclesiastical history, ancient and modern ...: much corrected, enlarged and improved, from the primary authorities, Volume 1(A.H. Maltby, 1832) p.116.

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2nd-century bishops in Gaul Bishops of Vienne Year of birth unknown {{bishop-stub