From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be mother of', Sentence: 'Similarly , the Early Corinthian Church proclaimed the new Era by announcing to the world the Birth of the Holy Virgin Mary , who was to be the mother of Our Lord Jesus Christ , Who in turn , by His Birth , Was to bring a new Era into the world : the Era of Christianity .'
mother