Charles of Durazzo, also called Charles the Small, was King of Naples and the titular King of Jerusalem from 1382 to 1386 as Charles III, and King of Hungary from 1385 to 1386 as Charles II. In 1381, Charles created the chivalric Order of the Ship. In 1383, he succeeded to the Principality of Achaea on the death of James of Baux.

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.