Joanna of Austria, Princess of Portugal (died 1573)

Joanna of Austria, Princess of Portugal

Infanta of Spain, Archduchess of Austria and Princess of Portugal

Joanna of Austria was Princess of Portugal by marriage to João Manuel, Prince of Portugal. She served as regent of Spain for her brother Philip II during his trips to England to marry Mary I from 1554 to 1556, and 1556 to 1559. She was the mother of King Sebastian of Portugal.