"Ferdinand IV (8 September 1633 – 9 July 1654) was made and crowned King of Bohemia in 1646, King of Hungary and Croatia in 1647, and King of the Romans on 31 May 1653. He also served as Duke of Cieszyn.
Born in Vienna on 8 September 1633, and baptised as Ferdinand Franz, Ferdinand IV was the eldest son of Ferdinand III, Holy Roman Emperor and his first wife Maria Anna, the daughter of Philip III of Spain. At a young age, Ferdinand IV took his father´s role as Archduke of Austria. In 1646, Ferdinand IV became King of Bohemia as he shared the role with his father Emperor Ferdinand III. He was crowned on 5 August 1646, and also shared the role of Duke of Cieszyn with Ferdinand III. Ferdinand IV also shared the role as King of Hungary and Croatia with his father; his coronation took place on 16 June 1647 in Pressburg, present-day Slovakia." - (en.wikipedia.org 31.01.2020)
