The same year Valdemar returned, and the same year too witnessed the extinction of the ducal line of Sleswic, which, as we have before related, originated in Abel, king of Denmark. To recover the duchy was the object of Valdemar, long before duke Henry’s death; and when that event arrived, his measures were so well taken, that in a few weeks most of the fortresses were in his possession. But the counts of Holstein urged their claim, in virtue of the agreement between their father, Gerard, and the duke of that period. They did not, however, immediately proceed to hostilities, nor was it their fortune to measure swords with Valdemar, while busily occupied in the internal reforms which he had so long contemplated, he saw that war was inevitable; and in this apprehension he besought pope Gregory XI. to interfere in his behalf—to teach his subjects obedience, and his enemies moderation. The pope, in his reply, professed his willingness to espouse the royal cause; but before his interference could be availing, Valdemar was no more. He died through his confidence in a quack, whose medicines he took. By his queen, Hedwige, he had six children, four of whom preceded him to the tomb. The survivors were two daughters—Ingeburga, married to Henry duke of Mecklenburg, and the celebrated Margaret, afterwards queen of the North. [Sidenote: 1375.] Valdemar was the first Danish monarch that styled himself king of the _Goths_. The assumption was occasioned, either by the conquests which he made in Gothland (they were very temporary), or by the diversions which Albert, to preserve his alliance, proposed to make, and, in fact, did make, in that province. OLAF III. 1376–1387. [Sidenote: 1375, 1376.]