He was Lothair II, emperor of Lotharingia (Lorraine) from 825 to 869. Frankish emperor; husband of Theutberga 1 whom he divorced in spite of the disapproval of the bishop of Rome, Nicolas I (Nikolaos 28); he secured the approval of leaders of the Frankish Church for his divorce and for his subsequent marriage to his mistress Waldrada 1; the matter was then referred again to the pope: Lib. Pont. 107. 44-47. More is recorded about this affair in the Annals of Hincmar s. a. 863 and 864 and in letters of pope Nicolas I (Nikolaos 28) (see Jaffé 2886) (see Duchesne, Lib. Pont. II, p. 170, nn. 41ff.). Councils at Aix-la-Chapelle in 860 approved his divorce from Theutberga 1 and another Council at Aix in 862 gave him permission to marry Waldrada 1. Described (wrongly) as king (ρήξ) of Italy and alluded to as Lotharios the elder (ὁ μέγας Λωθάριος); he was a descendant of Charlemagne (Karoulos 1) and grandfather (ὁ πάππος) of Hugh (of Arles, king of Italy; PBE II); he allegedly marched to Rome where the pope crowned him, but on his way home, he died at Pavia: Const. Porph., DAI 26, 1ff. See also DAI, Comm., ed. Jenkins, p. 83.

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