["Didaco comite" donated property to the monastery of San Felices de Oca, by charter dated 15 Mar 863, witnessed by "Gomaze, Gogenellu, Sarrazino…". "Didaco comite" donated property to the monastery of San Felices de Oca, by charter dated 864, witnessed by "Gomaze, Gonellu, Sarrazino…". "Comite Didaco" donated property to the monastery of San Felices de Oca, by charter dated 869 "regnante Adefonso in Oveto et Didaco comite in Castella", witnessed by "Gomaze, Flagino". Martínez Díez indicates that these charters are all falsifications, highlighting in particular that they are dated during the period of Diego´s father´s rule as count.
He succeeded his father as Conde en Castilla. The Chronicon Albeldense records that “Didacus filius Ruderici erat comes in Castella” during the reign of Alfonso III King of Asturias, dated to 882. The Chronicon Albeldense records in 883 that the Muslims (“Almundar, Mahomat regis filius cum duce Abohalt”) invaded “ad terminos Castellæ in pont Curbo castro”, adding that “Didacus comes” ruled. He expanded the county to the south towards the source of the River Ebro, restoring the town of Oca. The Chronicon Burgense records that “Didacus comes” populated Burgos in 884.
The Crónica Najerense records that “el conde Diego” repopulated Burgos in 884 and died “en Cornuta” 31 Jan 885. 1
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