The Collaborative International Dictionary of English v.0.48:
Emancipator \E*man"ci*pa`tor\, n. [L.] One who emancipates. [1913 Webster]WordNet (r) 3.0 (2006):
emancipator n 1: someone who frees others from bondage; "Lincoln is known as the Great Emancipator" [syn: emancipator, manumitter]