Joanna of Austria was an Infanta of Spain by birth and 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.
- Occupation
- politician
- Position held
- regent
- Citizenship
- Spain, Kingdom of Portugal
- Born
- June 24, 1535, 1537
- Died