Wilchar's loss of his diocese may be linked to the death of Carloman. He remained, however, as an archbishop with authority in all of Gaul but without a see. An identical position had been held by
Boniface in 744–745 before the creation of the
archbishopric of Mainz. Likewise, Wilchar was the "
de facto successor to
Chrodegang" at the head of the Frankish church. As archbishop, Wilchar may have consecrated Charles and his wife,
Hildegard, as
king and queen of the Lombards in
Pavia in 774. He led another embassy to Rome in 775 and in 780 was recalled by
Pope Hadrian I. Sometime before 786, probably in 780 or 781, Wilchar, with papal permission, consecrated the
Goth Egila as a peripatetic bishop in Spain. This is the second recorded time that Wilchar received authorization to consecrate a bishop by himself. The mission was a disaster. Archbishop
Elipandus of Toledo accused Egila of falling in with the heretical sect of
Migetius, while Elipandus was accused of adhering to
Adoptionism. According to a letter of Hadrian in the
Codex Carolinus, the mission was Wilchar's idea and he had assured the pope of Egila's theological bona fides. It is clear that Wilchar had the permission of Charles also for this mission and the king may even have been the initiator. In 782, Mainz and
Reims were raised to archbishoprics, but Wilchar retained this precedence as archbishop of the Gauls. He took part in the
Council of Paderborn in 785. While there, he and Bishop
Angilramn of Metz issued a privilege for the monastery of
Salonnes, a dependency of
Saint-Denis. He died in 786 or 787. ==Bishop of Vienne and Sion?==