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He makes little use of other narrative histories, which were the main sources of the contemporary chronicles called Chronicon mundi and De rebus Hispaniae.
The sources upon which the work draws most heavily for details were the lengthy Latin chronicles that, at that time, constituted the most complete account of the history of Spain: the Chronicon mundi (1236) by Lucas de Tuy, bishop of Tuy, known as el Tudense, and De rebus Hispaniae (1243) by Rodrigo Ximénez de Rada, bishop of Toledo, known as el Toledano.
According to Lucas de Tuy, writing his Chronicon mundi over a hundred years later, Martín was a victim of the Battle of Uclés in May 1108.