From the parish church of Baltarga, dedicated to St Andrew, much of the mural painting on the vault and the preapsidal arches has been preserved.

In the middle of the first arch is a wide circle from which emerges The Right Hand of God.

The divine hand is blessing Abel on the right, offering the lamb; on the left, Cain is offering God the fruits of the earth.

The central part of the vault is dominated by the Maiestas, Mariae, inscribed in a wide circular aureola surrounded by four angels.

In the upper left register is a scene from the Miracle of the fishing. The figure of Christ appears with hand outstretched to the two fishermen, whom legend identifies as Peter and Andrew, at the moment when they haul in a net full of fish.

In the first register on the left side is the Last Supper. A long fret separates this register from the lower one, where a scene of the Crucifixion must have appeared, but only two circles enclosing the anthropomorphic figures of the Sun and Moon remain.