the.com/emancipator

Someone who frees others from oppression, sometimes expecting lasting gratitude in return.

means Someone who sets another person or group free from slavery, oppression, or restraint.

from From Latin emancipare, 'to release from ownership,' built from e- ('out of') plus mancipium ('ownership'), which comes from manus ('hand') and capere ('to take'). To emancipate is literally to take something out of another's hand. The '-or' ending names the person doing it.

etymology
latin for out of one's hand
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