Charles I of Austria or Charles IV of Hungary was, among other titles, the last ruler of the Austro-Hungarian Empire. He was the last Emperor of Austria, the last King of Hungary, the last King of Bohemia and Croatia and the last King of Galicia and Lodomeria and the last monarch of the House of Habsburg-Lorraine.
He was King of Hungary from 1916 until 1918, when he renounced participation in state affairs, but did not abdicate. He spent the remaining years of his life attempting to restore the monarchy until his death in 1922.
Catholic Church leaders have praised Charles for putting his Christian faith first in making political decisions, and for his role as a peacemaker during the war. They have considered that his brief rule expressed Roman Catholic social teaching, and that he created a social legal framework that in part still survives. After his beatification, he has become commonly known as Blessed Charles of Austria.