These paintings decorating the apse were discovered in July 1983 during the restoration of the church of Sant Vicenç de Rus. They were restored at the National Museum of Art of Catalonia and taken to the Museum of Solsona in 1987, where they were installed by the Restoration Centre of Sant Cugat, recovering the original form of the apse.
On the vault, in a very poor state of repair, it is possible to make out the bottom of the vesica piscis, the feet of Christ in Glory, the legs of the creatures of the tetramorph and angel wings. The meander is inscribed with verse 12 of Chapter seven of the Book of Revelation, which, translated, reads: Praise and glory and wisdom and thanks and honour and power and strength be to our God forever and ever.
The cylindrical wall contains the figures of the Apostles, most of whom are holding a scroll. It is possible to identify the figures by some of their traits and the inscriptions surrounding them. To the right of the window, the first is Paul. Much of the wording is damaged and difficult to read. However, it appears that Thomas and Andrew are two of the apostles represented. On the left of the window, we can easily spot Peter with the keys in his hand.
In the window, inside a clipeus, there is a representation of the Holy Spirit and, on either side, two characters that have been traditionally identified as Cain and Abel, although recent studies called this identification into question.