Joanna of Austria, Princess of Portugal

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Joanna of Austria
Princess of Portugal
Portrait by Alonso Sánchez Coello, c. 1557
Born	24 June 1535 Madrid, Crown of Castile
Died	7 September 1573(1573-09-07) (aged 38) El Escorial, Crown of Castile
Burial	Convent of Las Descalzas Reales
Spouse	John Manuel, Prince of Portugal ​ ​ (m. 1552; died 1554)​
Issue	Sebastian of Portugal
House	Habsburg
Father	Charles V, Holy Roman Emperor
Mother	Isabella of Portugal

Joanna of Austria (in Castilian, Doña Juana de Austria; in Portuguese, Dona Joana de Áustria, 24 June 1535 – 7 September 1573) 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.

Married at 16 to her even younger husband, Joanna was widowed after two years, giving birth in the same month to her only child. Later that year Joanna returned to Spain at her father's request, leaving her young son in the care of her mother-in-law, who was also her aunt. She never saw Sebastian again, but corresponded and had portraits sent. In later life Joanna was active in religious affairs.