Charles, Margrave of Burgau, also known as Charles of Austria,, was the son of Archduke Ferdinand II of Austria and his first morganatic marriage to Philippine Welser. He was the brother of Andrew of Austria.

Ferdinand II, Archduke of Further Austria was ruler of Further Austria and since 1564 Imperial count of Tyrol. The son of Ferdinand I, Holy Roman Emperor, he was married to Philippine Welser in his first marriage. In his second marriage to Anna Juliana Gonzaga, he was the father of Anna of Tyrol, future Holy Roman Empress.