Louis I, also Louis the Great or Louis the Hungarian, was King of Hungary and Croatia from 1342 and King of Poland from 1370. He was the first child of Charles I of Hungary and his wife, Elizabeth of Poland, to survive infancy. A 1338 treaty between his father and Casimir III of Poland, Louis's maternal uncle, confirmed Louis's right to inherit the Kingdom of Poland if his uncle died without a son. In exchange, Louis was obliged to assist his uncle to reoccupy the lands that Poland had lost in previous decades. He bore the title of Duke of Transylvania between 1339 and 1342 but did not administer the province.
Louis I as depicted in the Chronicon Pictum
Louis's birth depicted in the Illuminated Chronicle
King Louis I as depicted in the Secretum Secretorum
Charles, Margrave of Moravia (the future Charles IV, Holy Roman Emperor), the father of Louis's first wife, Margaret of Bohemia (from the Gelnhausen Codex)
The King of Hungary was the ruling head of state of the Kingdom of Hungary from 1000 to 1918. The style of title "Apostolic King of Hungary" was endorsed by Pope Clement XIII in 1758 and used afterwards by all monarchs of Hungary.
Crown Jewels of Hungary
The coronation of Leopold II at St. Martin's Cathedral in 1790, in Pozsony, site of Hungarian coronations between 1563 and 1830