Salazar y Castro, in his genealogical table of the Visigothic kings, shows "Veremundo Duque de Cantabria" and "Pedro Duque de Cantabria" as the sons of King Ervigio. The primary sources on which these statements are based are not specified. The table includes numerous errors and the information should therefore be viewed with caution. The Chronicle of Alfonso III describes Pedro´s son, Alfonso I King of Asturias, as "of the royal line" without specifying his ancestry. The Historia Silense names "Petrus ex Recaredi…Gotorum principis progenie", although Pedro's descent from King Recaredo I cannot be established. When recording the succession of "roi Alphonse, fils de Pedro", Ibn-Khaldun states that, according to Ibn-Haiyan, he descended "des Goths" but that "à mon avis cette opinion est erronée". It is possible that this alleged family relationship with the Visigoths was an invention by later genealogists wishing to fill information gaps left by the primary sources. His name suggests Greek, and by extension Roman, origin.
[Duque de Cantabria]: the Chronica Albeldense records him as “Petri Cantabriæ ducis”. .The historical basis for supposing that there was a "Dukedom of Cantabria" under the Visigoths is unclear.
The name of Pedro's wife is not known. An indication of her family is provided by the charter dated 11 Nov 741 under which [her son] “Aldefonsus rex et uxor mea Hermesendis regina” donated various churches to “Adulfo abbati...domino meo et avunculo meo...qui in monasterio Beatæ Mariæ de Covadonga”, although this charter is classified as “faux” by Barrau-Dihigo. The family origin of Abbot Adaulf has not otherwise been traced. 1