The exceptional reuniting of a group of dispersed mural paintings from the middle of the 13th century, which once decorated one of the chapels in the cathedral of La Seu d’Urgell, has allowed various specialists to gain in-depth knowledge of the work in all its complexity: the introduction of the iconography and the worship of Saint Catherine to the West, the relationship of the paintings with the anti-Cathar conflict in the time of the bishop of Urgell, Ponç de Vilamur (1230-1257), the important moment of stylistic transition between Romanesque and Gothic to which they bear witness, their peculiar painting technique and the history of their removal and dispersion.