Latinization refers to the introduction of Roman Catholic elements of theology or praxis into non-Roman traditions. Examples of such traditions have included the Celtic, Mozarabic and Gallican Rites in the west, and the Byzantine, Maronite, and Coptic Churches in the east. In some cases, Latinization has completely supplanted the older traditions. In other cases, especially in the East, churches coming under the authority of the Vatican are allowed to maintain some of their particular institutions while having to accept other particularly Roman Catholic elements.