of his three children and her devotion to the religious patronage of the Dominican Order. In September 1390, Catherine accepted the authority of the Avignon Papacy, under Antipope Clement VII and became a staunch supporter. The couple's three children: Maria of Castile (1401–1458), who married Alfonso V "the Magnanimous", King of Aragon and Naples, without issue Catherine of Castile (1403/1406–1439), who wed as his first wife in 1420 Henry of Aragon, 4th Count of Alburquerque, 32nd Count of Ampurias and 35th Master of the Order of Santiago (1400-Calatayud, 1445), without issue John II (1405–1454), who succeeded his father as King of Castile. Widowhood Regency with Ferdinand Henry III died in 1406, and according to his will, his widow, Catherine, and his brother, Ferdinand I of Aragon were to be joint regents during John II's minority, sharing their power with a royal council. Of those three parties, Ferdinand was to be the one with the greatest share of power. However, the custody of John II was given to two nobles, Diego López de Zúñiga and Juan Fernandez de Velasco. Catherine prepared to defend herself and her household in a famous Spanish castle, the Alcázar of Segovia, because she was not willing to relinquish her year-old son. Ferdinand was eventually able to make a deal that allowed Catherine to maintain custody of her son. Ferdinand ordered Mudéjars (Muslims living in Christian Spain) to wear a symbol; a blue moon on their clothing. They were not allowed to leave their homes, nor were they allowed to work or trade with Christians. The Jews, too, were not allowed to work or trade with Christians. This was an attempt by John II to suppress religious minorities, which was supported by Catherine and only lasted until her death. Furthermore, tensions between the regents led to a division of rule. The royal council awarded Catherine control over the Northern part of the Kingdoms of Castile, and Leon. As Catherine became increasingly involved in the wars of Ferdinand against Granada in the south, Castile's alliance with France suffered and she was able to strengthen her relations with Portugal, where her half-sister Philippa was queen, and with England, where her half-brother Henry IV ruled since 1399. Catherine and her half-brother fostered the trade between Castile and England. Her international policies were beneficial to the Castilian communities, but her co-regents did not always act in their best interests. Because of