His origins lie in the same landed and wealthy aristocratic family as those of the Count Piniolo (Piñolo) who founded the monastery of San Juan Bautista de Corias.
According to a theory advanced by Carlos González de Posada (1745–1831) and Manuel Risco there were two Ovecos who were bishops of Oviedo between 913 and 961.
These years in the history of the diocese of Oviedo are extremely obscure and must be reconstructed primarily from documentary evidence extracted with care from amongst the forgeries of Bishop Pelagius.
While Oveco does not appear in any royal charters of 918 or 919,[2] his importance is illustrated by his place among the signatories of Ordoño's concessions to Santos Cosme y Damián dated 12 April 920.
In a royal charter of 1 August 922 Oveco is listed first among the bishops, probably by then the senior member of the Asturian episcopate.
When Ordoño was succeeded by his brother Fruela, who had already been ruling Asturias, in 924 the royal court was moved from León back to Oviedo.
On 13 September 936, Froila Gutiérrez and his wife donated a parcel of land to his brother Rudesind for the construction of a monastery, later known as Celanova.
This donation was undersigned by the king first, Rudesind second, and Oveco third, who is qualified as gerens pastorali cura Ouetencis ecclesia et regia sedem ("bearing pastoral care of the royal see and church of Oviedo").