The Chronicon Burgense is named after the Cathedral of Burgos, where it was discovered on one folio of a surviving thirteenth-century obituary/calendar.
It deals primarily with matters in the Kingdom of Castile and may have been written at Burgos, the Castilian capital.
It also touches on the Kingdom of Navarre (in which La Rioja lay) and covers the period from the Nativity of Jesus to the Battle of Las Navas de Tolosa in 1212.
It is a unique source for several details relating to early Castilian history.
Fuit hiems gravissima a festivitate S. Martini usque ad Quadragesimam, & in ipso anno pugnaverunt duo milites pro lege Romana, & Toletana in die Ramis palmarum, & unus eorum erat Castellanus, & alius Toletanus, & victus est Toletanus a Castellano.