He makes little use of other narrative histories, which were the main sources of the contemporary chronicles called Chronicon mundi and De rebus Hispaniae.
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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.
After the comarca was conquered in 1199–1200 by Alfonso VIII of Castile, it retained the name of Ivita, Ibidam, or Uda and continued to be identified as a specific part of the land of Álava, as is clearly indicated in De rebus Hispaniae by archbishop Rodrigo Jiménez de Rada.