CRUSADER

Crusader

(noun) a warrior who engages in a holy war; “the Crusaders tried to recapture the Holy Land from the Muslims”

reformer, reformist, crusader, social reformer, meliorist

(noun) a disputant who advocates reform

Source: WordNet® 3.1

Etymology

Noun

crusader (plural crusaders)

(historical) A fighter in the medieval Crusades.

(figurative) A person engaged in a crusade.

Source: Wiktionary

Cru*sad"er (-s"dr), n.

Definition: One engaged in a crusade; as, the crusaders of the Middle Ages. Azure-eyed and golden-haired, Forth the young crusaders fared. Longfellow.

Source: Webster’s Unabridged Dictionary 1913 Edition