Lothair II of France

Definition and stakes

Various Encyclopaedia Britannica, 11th Edition…

In 980, regretting his fruitless quarrel with Otto II., who had ravaged the whole country as far as Paris, and fearing that even with the support of the house of Vermandois he would be crushed like his father Louis IV. between the duke of France and the emperor, who could count on the archbishop of Reims, Lothair made peace with Otto—a great mistake, which cost him the prestige he had gained among his nobles by his fairly successful struggle with the emperor, drawing down upon him, moreover, the swift wrath of Hugh, who thought himself tricked.
Source: Gutenberg

T. F. Tout The Empire and the Papacy, 918-1273

Both in policy and resources he overmatched the young king Lothair, who tried as he grew up to play his father’s part; but his means were too small, and he embarked on contradictory policies which destroyed 70each other. His father had relied upon the support of Otto I., but Lothair, tempted by the long tradition of loyalty which bound Lotharingia to the Carolingian house, sought to find a substitute for his dwindling patrimony in northern France by winning domains for himself in that region.
Source: Gutenberg

T. F. Tout The Empire and the Papacy, 918-1273

The strong Saxon kings would not tolerate the falling away of Lorraine from their Empire. Otto II. invaded France [see page 38] and vigorously punished the presumptuous Carolingian. Henceforth Lothair had no support against the subtle policy of the new Duke of the French. He even alienated Adalbero, the famous Archbishop of Reims, and the last prominent ecclesiastical upholder of the tottering dynasty, so that he repudiated the traditional policy of his see, and allied himself with the duke and the Emperor.
Source: Gutenberg

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