 He inherited the territories of the Holy Roman Empire as well as the crowns of Castille and Aragon.In the Indies, recently discovered by Cristopher Columbus for Castille and Aragon, he ordered the conquistadores to annex the Aztec Empire and conquer the Incas.He made use of the gold and silver coming from the Americas to finance the defence of his German territories in Austria from the Ottoman Empire (Siege of Vienna) and his Italian territories in the Duchy of Milan from France (Battle of Pavia).