For the work Vagad consulted the archives of San Juan de la Peña, San Victorián, Poblet, Montearagón, and Barcelona among other archives of the Crown of Aragon.
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In peninsular matters his Aragonese bias is evident, as when he devalues the conquest of Valencia by the Castilian folk hero El Cid (1094) relative to the conquest of the same city by James I of Aragon (1236).
Gualberto Castro | Gualberto Ibarreto | Fabricio | José Gualberto Padilla | Gualberto Fabricio de Vagad | Giovanni Gualberto Magli | Fabrício Ramos Melo |
According to Gualberto Fabricio de Vagad in his Crónica de Aragón (1499), the second king of Sobrarbe, Garzía Ennéguiz (Garci Íñigo), conquered Pamplona from the Muslims in the time of Charlemagne.