António, Prior of Crato

António
Anthonius Coninck van Portugal en Algarve showing the medal of the Order of Aviz in a Flemish engraving of 1595
King of Portugal and the Algarves (disputed)
Reign	24 July 1580 – 25 August 1580
Acclamation	24 July 1580, Santarém
Predecessor	Henry
Successor	Philip I
Born	1531 Lisbon, Portugal
Died	26 August 1595 (aged 63–64) Paris, France
Partner	Ana Barbosa
Issue	Manuel Cristóvão Dinis João Filipa Luísa
House	Aviz
Father	Louis, Duke of Beja
Mother	Violante Gomes
Religion	Roman Catholicism

António, Prior of Crato (Portuguese pronunciation: [ɐ̃ˈtɔniu]; 1531 – 26 August 1595; sometimes called The Determined, The Fighter or The Independentist), was a grandson of King Manuel I of Portugal and claimant of the Portuguese throne during the 1580 dynastic crisis. According to some historians, he was King of Portugal as António I of Portugal for 33 days in 1580. After the crowning of Philip II of Spain as King of Portugal, António claimed the throne until 1583. He was a disciple of Bartholomew of Braga.

António was born in Lisbon, the illegitimate son of Prince Louis, Duke of Beja (1506–1555) and Violante Gomes (some sources argue that his parents were later married, perhaps at Évora). His mother may have been of Sephardic Jewish extraction, as many Portuguese sources maintain, or possibly of "new Christian" (a forced convert of Jewish or Muslim origin) extraction. At least one source says she was a member of the minor Portuguese nobility, the daughter of Pedro Gomes from Évora. She died a nun at Santarém on 16 July 1568.

António was educated in Coimbra, and he was placed in the Order of St. John. He received the wealthy priory of Crato as a benefice. In 1571, he was named governor of the Portuguese fortification at Tangiers in Morocco.