Leopold I, was Holy Roman Emperor, King of Hungary, Croatia, and Bohemia, he's the second son of which emperor?
Leopold I, Holy Roman Emperor Leopold I (name in full: "Leopold Ignaz Joseph Balthasar Felician"; Hungarian: "I. Lipót" ; 9 June 1640 – 5 May 1705) was Holy Roman Emperor, King of Hungary, Croatia, and Bohemia. The second son of Ferdinand III, Holy Roman Emperor, by his first wife, Maria Anna of Spain, Leopold became heir apparent in 1654 by the death of his elder brother Ferdinand IV. Elected in 1658, Leopold ruled the Holy Roman Empire until his death in 1705.
Conrad II, Duke of Bohemia Conrad II Otto (Czech: "Konrád II. Ota" ;  1136 – 9 September 1191), a member of Přemyslid dynasty, was the first Margrave of Moravia from 1182 to 1189 and Duke of Bohemia from 1189 until his death.