chivalrous (adj.)

mid-14c., "pertaining to chivalry or knight-errantry," from Old French chevaleros "knightly, noble, chivalrous," from chevalier (see chevalier; also compare chivalry). According to OED, obsolete in English and French from mid-16c. Not revived in French, but brought back in English 1770s by romantic writers with a sense of "having high qualities (gallantry, courage, magnanimity) supposed to be characteristic of chivalry." Related: Chivalrously; chivalrousness.