In total, there are 22 letters on various topics that are credited to Valera addressed to kings or other important individuals. María de los Ángeles Suz Ruiz states that the many epistolary works Valera wrote as well as those of his contemporaries were fundamental in understanding the political unrest of that period (15). During the fifteenth century, several nobles felt compelled to write King Juan II about to Luna. Diego de Valera was one of those nobles. Forced to pick a side, he chose that of Álvaro’s adversaries (Contreras 58). His letter to the King Juan II indicates he was starting to turn against the Condestable. While the letter did not directly mention Álvaro, it did refer to him in an impartial manner and suggested and counseled
