Catholicism is the traditions and beliefs of Catholic Churches. It refers to their theology, liturgy, morals and spirituality. The term usually refers to churches, both western and eastern, that are in full communion with the Holy See. In 2012, there were more than 1.1 billion Catholics worldwide.
The stone sarcophagi of Roman Christians exhibit the earliest surviving carved statuary of Jesus, Mary and other biblical figures. The legalisation of Christianity with the Edict of Milan (313) transformed Catholic art, which adopted richer forms such as mosaics and illuminated manuscripts .