John, Constable of Portugal

Infante John
Constable of Portugal Lord of Reguengos de Monsaraz, Colares and Belas
Detail from the St. Vincent Panels by Nuno Gonçalves, often believed to be a portrait of John of Reguengos, the Constable Prince.
Born	13 January 1400 Santarém, Portugal
Died	18 October 1442(1442-10-18) (aged 42) Alcácer do Sal, Portugal
Burial	Batalha Monastery
Spouse	Isabella of Barcelos ​ ​ (m. 1424)​
Issue Detail	Infante Diogo, Constable of Portugal Isabella, Queen of Castile Infanta Beatrice, Duchess of Viseu
House	Aviz
Father	John I of Portugal
Mother	Philippa of Lancaster

Infante John, Constable of Portugal (Portuguese: João, Portuguese pronunciation: [ʒuˈɐ̃w]; 13 January 1400 – 18 October 1442) was a Portuguese infante (prince) of the House of Aviz, Constable of Portugal and master of the Portuguese Order of St. James (Santiago). In Portugal, he is commonly referred to as the O Infante Condestável ("the Constable Prince").