Domes were important elements of baptisteries, churches, and tombs. At Ravenna are two noted baptisteries, decorated with fine mosaics. He has the right to consecrate parishes, altars, baptisteries and all ecclesiastical foundations. There were two baptisteries, both near the greater church. He also consecrates all Church buildings, altars, baptisteries, holy vessels and vestments. As the requirements for Christian baptisteries expanded, Christianization of sacred pagan springs presented natural opportunities. The mortuary tradition has been expressed in domed mausoleums, martyriums, and baptisteries. Some small buildings remain, especially baptisteries, which fell out of fashion and were spared rebuilding. Ruins of baptisteries have also been found at Salona and in Crete. After the 9th century, with infant baptism increasingly the rule, few baptisteries were built. Baptisteries were thus attached to the cathedral and not to the parish churches. Baptisteries often occur in Italy as a free standing structure, associated with a cathedral.