Lopes threw himself into the task. Fernão Lopes is acknowledged as the author of at least three chronicles: of the reign of king Peter I (r.1357-1367), of the reign of Ferdinand I (r.1367-1385) and the first two parts of the reign of John I (1385 up to year 1412, his successor Gomes Eanes de Zurara would produce the third and final part). Fernão Lopes is believed by some modern historians to also be the author of an anonymous history of the constable Nuno Álvares Pereira and, more contentiously, of a summary chronicle of the first several kings of Portugal (of which two drafts exist — one of the first five kings (Porto MS), another of the first seven (Cadaval or '1419' MS). Fernão Lopes held his official positions until around 1454, when he was forced to retire on account of his advanced age, and was succeeded by Gomes Eanes de Zurara. Lopes died sometime after 1459. The last known information about Fernão Lopes states that he was still living in 1459, when he challenged the rights of an illegitimate grandson to his inheritance. The date of his death is uncertain. According to information in the preface of the Chronica de El-Rei D. Pedro I, written by Luciano Cordeiro, after leaving the role of chief guard, Fernão Lopes would still have lived for another five years, dying close to the age of 80. Fernão Lopes was married to an aunt of the shoemaker Diogo Afonso's wife, leaving a son, Master Martinho, who was "physical" (doctor) of the infant D. Fernando. Martinho had a bastard son, Nuno Martins. It has been controversially alleged by some historians (starting with Damião de Góis) that later 16th-century chroniclers Duarte Galvão and Ruy de Pina composed their chronicles of the remaining reigns from draft manuscripts left behind by Fernão Lopes — not merely drawing upon them, but plagiarizing them in whole or in part, to the point that Fernão Lopes is sometimes credited as their joint author. While there is some evidence that Galvão's chronicle of Afonso I might have copied parts from Lopes's manuscripts, historians generally agree that the accusation against Ruy de Pina is largely unmerited and unjust. Works Uncontested (written by Fernão Lopes in 1430s & 1440s; original manuscripts lost; first published in 17th and 18th centuries on the basis of draft copies produced in the early 16th century.) ("Chronicle of king Peter