[2] In 970, during the reign of Ramiro III of León, a monk named Oveco in the monastery at Valcavado copied and made miniatures on parchment for Valcavado's abbot, Sempronio, of the commentary by Saint Beatus of the Santo Toribio de Liébana monastery between 765 and 775 AD.

It consists of 230 folios conserved in good condition—another fourteen are missing—measuring 35.5 x 24.5 cm and containing 87 miniatures and numerous drop capitals.

The bright colors come from azurite, malachite and cinnabar pigments mixed with egg, honey or glue, and varnished with a coat of wax.

The figures de of people are limited to lines and their expressivity comes from their large almond-shaped eyes.

[3] One of the first sentences in the beato is: "Hoc opus your fieret prae-dictus Abbas Sempronius instanter egit, cui ego Oveco indignus mind obediens worshipper depinxi".