The Titulus, in Palermo Cathedral, is the space where the Canons Regular sat, taking their place in the choir, and which contained both the bishop’s chair and the royal seat. Next to the Titulus and Antititulus are the sacristies, which have now been converted into the Cathedral Treasury. In the Monreale Cathedral, it corresponds to the presbyterial area near the organ. This term is very old, having appeared in medieval diplomas from the 12th and 13th centuries. The tombs of the kings were on either side of the titulus.