Mary, Mother of God

This is the oldest title given to Mary. In 325 the first ecumenical council at Nicaea proclaimed that Jesus id truly the Son of God. Defenders of the faith at that council were the first to call Mary "Mother of God". This title was formally established in 431 at the council of Ephessu and after that time the title was adopted in the prayers of the Mass. The Feast Day of Mary, Mother of God is January 1st. 

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