His filiation has not been documented; from his patronymic it is known that his father was named Fernando[2] and the presence of another count at court named Diego Fernández, ancestor of a powerful family in northern Portugal, has led to the two being viewed as powerful brothers.

[5] He was the tenant-in-chief of Lugo and on 7 July 910, while in this region, he confirmed a document addressed to King Ordoño II whereby he and several other counts promised to rebuild the homes that had been destroyed in the city.

[6] A year later, on 22 April 911, he witnessed a charter of King Ordoño confirming to the Cathedral of Santiago the donations that had been made by his predecessors.

He appears for the last time on 24 September 926 confirming the bride token given by Gunterico Arias to Eros's granddaughter Gontrodo González.

From his first marriage with Adosinda of Monterroso (died before 898),[2][1][3] he had two children:[2][3] Around 898, he married again, this time to countess Elvira, who made a generous donation that year to the Monastery of Ferreira de Pallares which both had founded.