Pontifical gloves are liturgical ornaments used primarily by the pope, the cardinals, and bishops. They may be worn only at the celebration of mass. The liturgical use of gloves has not been traced beyond the beginning of the 10th century, and their introduction may have been due to a simple desire to keep the hands clean for the holy mysteries, but others suggest that they were adopted as part of the increasing pomp with which the Carolingian bishops were surrounding themselves. From the Frankish kingdom the custom spread to Rome, where liturgical gloves are first heard of in the earlier half of the 11th century.