The first is a catalogue of the excesses of the middle and upper class of Sahagún between the years 1109 and 1117. Perhaps it was designed to be presented at the Council of Burgos in the latter year. If an early-twelfth-century provenance is correct then it must have originally been written in medieval Latin. It is a useful source of detail for the early reign of Urraca of León and Castile, since the monastery at Sahagún was the most important in her realms. The second chronicle, written in the fourteenth century, may have been either originally Latin or originally Spanish. It is generally of little use to the historian.
- Reilly, Bernard F. 1982. The Kingdom of León-Castilla under Queen Urraca, 1109–1126. Princeton: Princeton University Press.
- Reilly, Bernard F. 1988. The Kingdom of León-Castilla under King Alfonso VI, 1065–1109. Princeton: Princeton University Press.