Ecclesia Mater ("Mother Church") architecturally represented in a Paleochristian mosaic of the fourth or fifth century. Floor of the Funeral Chapel of Valentia. National Museum of the Bard (Tunisia).
Mother Church (Mater Ecclesia in Latin): Theological concept of "Holy Mother Church" (the Church as mother), especially used in the field of the Catholic Church eg: Gaudet Mater Ecclesia speech of Pope John XXIII for the inauguration of the Second Vatican Council.
Mother church synonymous with the parent church, the main church, or the main church (Cathedral). In this sense, it must be written in lowercase. Notes
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