Portrait of Sebastian I (1554-1578), King of Portugal and the Algarves (1557-1578), Regency (1557-1568), 1575
Dom Sebastian I (Portuguese: Sebastião I; 20 January 1554 – 4 August 1578) was King of Portugal and the Algarves from 11 June 1557 to 4 August 1578 and the penultimate Portuguese monarch of the House of Aviz. He was the son of João Manuel, Prince of Portugal, and his wife, Joanna of Austria. He was the grandson of King John III of Portugal and Holy Roman Emperor Charles V. He disappeared (presumably killed in action) in the battle of Alcácer.
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