RolandyoudaoicibaDictYouDict[Roland 词源字典]
masc. proper name, from French, from Old High German Hrodland, literally "(having a) famous land." As legendary nephew of Charlemagne, celebrated in "Chanson de Roland," c. 1300. His comrade was Oliver, hence a Roland for an Oliver (1610s) in expressions meaning "to give as good as one gets, tit for tat."[Roland etymology, Roland origin, 英语词源]