Together with his brother Leo, known as the Tuscan (Leo Tuscus), he was one of those numerous Latins who, admitted to the Byzantine court of Manuel Comnenus (1143-80), occupied an important position there. He played a significant role in the diplomatic relations that were established between the Latin and Byzantine Empires.
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UGO OF AMIENS - Incipit of the Dialogorum libri - Vatican Library, codex Reg. lat. 288, fol. 127 (late 12th century).
UGO OF GRANOBLE, Saint - Right panel of the triptych with Madonna, Child, Angels, and Saints, attributed to Macrino d'Alba (1494-1528). Susa, Cathedral.
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Ugo wrote the *Libri tres, sive quod Spiritus Sanctus ex utroque, Patre scilicet et Filio procedat, contra Graecos* (Basel 1543: PL 202, 227-396), in which he proves his thesis with numerous patristic texts; soon translated into Greek by the author himself, it exerted a beneficial influence; it was largely due to this work that the conversion of Patriarch John Beccos (Veccos) was achieved. A significant portion of another important *Tractatus contra Graecos* is preserved in the homonymous work written by the Dominicans of Constantinople and edited by J. Basnage, *Thesaurus monumentorum ecclesiasticorum*, IV, Antwerp 1725, pp. 29-86.
- See plate LXX.