viceroy (n.)youdaoicibaDictYouDict[viceroy 词源字典]
person ruling as representative of a sovereign, 1520s, from Middle French vice-roy, from Old French vice- "deputy" (see vice-) + roi "king," from Latin regem (nominative rex); see rex. The species of American butterfly so called from 1881.[viceroy etymology, viceroy origin, 英语词源]