The temple of San Martín de Salas has preserved several pieces adorned with beautiful protective crosses, a symbol of the Asturian monarchy that is also featured on the current flag of Asturias.

The victorious cross, from whose arms hang the apocalyptic Alpha and Omega, was adopted as an emblem by the Asturian monarchy, as evidenced by the numerous goldsmith’s crosses donated by the kings to the cathedrals.

The first piece is framed by a simple, smooth molding. The cross is centrally positioned, with the first and last letters of the Greek alphabet—alpha and omega—hanging from its arms.

An inscription at the top and bottom affirms its protective function, referencing the saving power of the cross in the presence of the Exterminating Angel. This biblical figure is known for annihilating the Egyptian firstborn during the last of the plagues, symbolizing the death of those who stray from divine laws.

The second piece features a molding adorned with a double rope or thick herringbone cord, a common decorative motif in the art of the Asturian monarchy. Although the inscription has been lost and is now illegible, the central Greek cross remains visible, referencing the Cross of the Angels donated by King Alfonso II to the Cathedral of Oviedo.

The third cross is located in the apse of the chapel.