Mary’s role vis-à-vis the tenuous relationship between Roman Catholics and other Christians may be likened to the proverbial image of a double-edged sword—the figure of the Mother of Jesus can serve as a common reference or rallying point among believers of various denominations, on the one hand, yet also act as an added obstacle to understanding and harmony between them, on the other. This paper explores the evolution of Marian doctrine and devotion in relation to the pursuit of ecumenical agreement and fellowship among the followers of Christ. – Author (first paragraph)