1590s, "fine appearance," from French galanterie (16c.), from Old French galant "courteous; amusing" (see gallant (adj.)). Meaning "gallant behavior" is from 1630s; meaning "polite attention to ladies" is from 1670s. Middle English had gallantness "merriment, gaiety, high living" (late 15c.).[gallantry etymology, gallantry origin, 英语词源]