The Historia de los Reyes Moros de Granada, written by the chronicler Hernando de Baeza in the first half of the XVI century, in Spain, is a valuable text that provides a very different perspective from other late medieval Spanish official chronicles. This article provides an account of the discovery of a previously unknown manuscript of this chronicle which, unlike the two others already known, is complete and includes the ending, which narrates the negotiations between the Catholic Kings of Spain and the last Nasrid sultan Boabdil for the Islamic surrender of Granada. The article describes this previously unknown manuscript, gives an account of the importance of the codex in which it is found, and shows the importance of this discovery for Spanish historiography more generally. A complete transcription in Castillian and an English translation are provided.