The paintings have been dated to around 1100, established indirectly on the basis of the architecture of the building and from comparison with the paintings in other churches in the valley of Boí: Sant Climent and Santa Maria in Taüll.

Their study has led to comparison with those of Saint Martin de Vicq (Nohant-Vicq, Indre, central France) from the second half of the twelfth century, in which has been found not so much a certain interdependence but the use of common, possibly Carolingian European models.

Exemplary scenes are depicted from the lives of saints, of which the most important fragment is the Lapidation of Saint Stephen, a vast repertory of animals of a moralistic nature (mainly on the intradoses of the arches) and a scene with minstrels, something very unusual, which in this case must be taken as being in praise of the Lord.

There was also a representation of the Day of Judgement from which the surviving fragments of Paradise, Hell and the apocalyptic dragon came.

The paintings from Boí must be considered an example of an underlying French influence in Catalonia which was different from the Italian influence that was to dominate the Romanesque pictorial scenario in Catalonia after the paintings of the Pedret Circle.