abnegator
n. C2 Proficiency ab·ne·ga·tor
n. a person who gives up their own needs and desires to help others. This word is very old and you will rarely see it in modern books.
n. a person who practices self-denial or sacrifices their own interests for the benefit of others. Archaic in modern usage; primarily found in historical or religious contexts.
The abnegator lived in a small room to help the poor.
In the old stories, the abnegator was often a monk who gave up all his possessions.
The historical account describes a figure who became an abnegator, dedicating his life to the service of others while rejecting the comforts of his former status.
From Late Latin abnegator, from abnegatus. Equivalent to abnegate + -or.