This man succeeded Rupert of Wittelsbach in his highest post.
Notable cousins of this man include Jobst of Moravia, whom this man put in charge of Brandenburg. This man succeeded Rupert of Wittelsbach in his highest post. At the behest of Pope Boniface IX, this man allied with Venice and launched a crusade against the Turks that ended in failure at the Battle of Nicopolis. This ruler presided over the Council of Constance and led the Catholic side in the Hussite Wars. Although this man personally unified Bohemia, Hungary, and the Holy Roman Empire, the only modern remnant of his empire is a microstate. For ten points, name this 1410-1437 Holy Roman Emperor from the smallest Low Country.
Notable cousins of this man include Jobst of Moravia, whom this man put in charge of Brandenburg.
{Sigismund} of {Luxemburg} [accept: {Sigismund von Luxemburg}; {Luxemburgi Zsigmond}; {Zikmund Lucembursky}]