Isabella of Urgell, Duchess of Coimbra (Spanish: Isabel) (12 March 1409 – 17 September 1459) was a Catalan noblewoman of the Urgell branch of the House of Barcelona. She was the wife of Infante Peter, Duke of Coimbra. Family Isabella was born on 12 March 1409, the eldest daughter of James II, Count of Urgell, and Isabella of Aragon. Isabella was one of five children. The county of Urgell was dissolved in 1413, following her father's revolt against the new King Ferdinand I of Aragon who had been chosen to succeed to the throne of Aragon in 1412 despite James being the closest legitimate agnate to the Royal House of Barcelona. Marriage On 12 September 1428 at Alcolea del Cinca she married Infante Peter, Duke of Coimbra (9 December 1392 – 20 May 1449 at the Battle of Alfarrobeira), a younger son of John I of Portugal. During her husband's regency for his nephew, Afonso V of Portugal, the marriage of the couple's daughter Isabella to the King was arranged. Issue Peter, Constable of Portugal (23 October 1429, Coimbra, Portugal – 29 June 1466) At the age of fourteen he became Constable of Portugal. In 1464, he was acclaimed King Peter V of Aragon. John of Coimbra, titular Prince of Antioch (1431, Coimbra, Portugal – 11 September 1457, Nicosia, Cyprus). On 26 February 1456, he married Queen Charlotte of Cyprus (28 June 1444 – 16 July 1487) as her first husband. Isabella of Coimbra (1 March 1432, Coimbra, Portugal – 2 December 1455). Married her cousin, King Afonso V of Portugal on 6 May 1448, as his first wife. They had three children, including King John II of Portugal. James of Coimbra, Cardinal and Archbishop-elect of Lisbon (17 September 1433, Coimbra, Portugal – 27 August 1457, Florence, Italy) Beatrice of Coimbra (21 November 1435, Coimbra, Portugal – 22 February 1462, Bruges). Married 13 May 1453 Adolph of Cleves, Lord of Ravenstein (28 June 1425 – 18 September 1492). Her death was attributed to poisoning. Philippa of Coimbra (1 June 1437, Coimbra, Portugal – 25 July 1493, Odivelas). She was a nun at the Convent of Odivelas. Catherine (circa 1448 – between 1462 and 1466) Widowhood and death Peter of Coimbra was regent of Portugal from 1439, and engineered the marriage of his young charge, Afonso V of Portugal with his daughter, Isabella of Coimbra in 1447. But he also gathered