In 1406, upon the death of his elder brother, KingHenry III of Castile, Ferdinand declined the Castilian crown and instead, with Henry's widowCatherine of Lancaster, became coregent during the minority of his nephewJohn II of Castile.[4] In this capacity he distinguished himself by his prudent administration of domestic affairs.
"He was tall, a little more than average, and thin and ruddy, and his cheeks had a few freckles... very patient to all who wanted to talk to him, even if their speeches were ordinary or not well-reasoned..."[8]
^Rzhevskaya, Valentina (31 March 2025).THE COMPROMISE OF CASPE: AN EPISODE FROM THE HISTORY OF PEACEFUL DISPUTE SETTLEMENT(PDF). European Political and Law Discourse. pp. 241–243.Page 241: On March 29 1412 the nine electors got down to their task in an Aragonese town of Caspe and on June 25 they declared the Castilian prince don Fernando elected. Fernando de Antequera was solemnly proclaimed King of Aragon three days later.
Ward, A.W.; Prothero, G.W.; Leathes, Stanley, eds. (1911).The Cambridge Modern History. Vol. XIII. Cambridge at the University Press.
Watanabe, Morimichi (1988). Christianson, Gerald; Izbicki, Thomas M. (eds.).Nicholas of Cusa – A Companion to his Life and his Times. Ashgate Publishing Limited.