Under the service of Emperor Sigismund, Henry X was a mediator in international affairs, and he was sent in a diplomatic mission to Denmark, where after successfully negotiations with the King Eric, was arranged his betrothal with the King's first cousin Adelaide (b. 1410 - d. aft. 1445), daughter of Duke Bogislaw VIII of Pomerania-Stargard; but he died soon after in a military camp in Flubsberg.