When Fernando died in 1383, he left no male heir to the throne. His only daughter, Beatriz, was married to Juan I, king of Castile. The marriage writ stipulated that their offspring would inherit the Portuguese crown if Fernando left no male heir and that, until any children were born, Portugal would beĶĶĶĶ ruled by a regency of Fernando's widow, Leonor Teles. When Fernando died, Leonor assumed the regency in accordance with the marriage writ. The assumption of the regency by the queen was badly received in many Portuguese cities because Leonor was a Castilian and considered an interloper who intended to usurp the Portuguese crown for Castile and end Portugal's independence. Leonor's principal rival for control of the throne was Joćo, the master of the Order of Avis and illegitimate son of Fernando's father, Pedro I (r.1357-67). On December 6, 1383, Joćo broke into the royal palace and murdered Count Andeiro, a Galician who had been Fernando's chancellor. Leonor Teles fled to the town of Alenquer, the property of the queens of Portugal. She appealed to Juan I for help, and he invaded Portugal in January 1384. Leonor abdicated as regent. In Lisbon the people proclaimed Joćo to be the governor and defender of the realm. Joćo immediately began to prepare an army and sent a mission to England to recruit soldiers for his cause.

Data as of January 1993