Theutgaud 1 was archbishop of Trier; he and Gunthar 1, the archbishop of Cologne ("Theutgaudum Treverensem et Guntharium Agrippinae coloniae archiepiscopos"), with Hagano 1 (bishop of Bergamo) and other unnamed bishops, allowed king Lothar II (Lotharios 2) to divorce his wife Theutberga 1 and marry his mistress Waldrada 1, to the anger of the bishop of Rome, Nicolas I (Nikolaos 28); they defended their action at a Council called at Metz by the envoys of Nikolaos 28, and then visited Rome to defend themselves before Nikolaos 28 in person, but were judged by him to have exceeded their authority; at a Council convened in the Lateran palace they were condemned for permitting the divorce of the king, for overturning the papal excommunication of Ingiltrudis 1 and for falsifying a letter written by the pope; they were then deprived of the priesthood and deposed: Lib. Pont. 107. 45-49.

Their colleague in the affair, bishop Hagano 1, was also deposed: Lib. Pont. 107. 50. The divorce was allowed at Councils held in 860 and the permission to marry Waldrada 1 was given in 862; the Council of Metz was in June 863; see Duchesne, Lib. Pont. II, p. 170, nn. 41-45. See also Hincmar, s.a. 864 (PL 125, 1216ff.) (for the violent outcome of these events at Rome, ending with the removal from office of Theutgaud and Gunthar) and s.a. 867 (PL 125, 1236) (they returned to Rome hoping to regain office, but Theutgaud 1 died and Gunthar 1 barely survived).

An opponent of the see of Rome, in 861 Theutgaud 1 submitted to pope Nicolas I (Nikolaos 28) but in 864, with Gunthar 1 (of Cologne) and Ioannes 315 (of Ravenna) and others he resumed hostilities: see Mansi XV 597-606. 147-153 and cf. above. Although excommunicated by pope Nicolas I (Nikolaos 28), he was able to receive communion in the confusion attending the consecration of pope Hadrian II (Hadrianos 8) in 867: Lib. Pont. 108. 10 ("Theutgaudus Trevirorum archiepiscopus").

(Publishable link for this person: )