Kalmar "Ivan the Terrible" yawanci tana nufin Ivan IV, wanda kuma aka sani da Ivan the Terrible, wanda shine Grand Prince na Moscow daga 1533 zuwa 1547, da kuma Tsar na farko na Rasha daga 1547 har zuwa mutuwarsa a 1584. " Mummunan” a cikin wannan mahallin ba lallai ba ne yana nufin mugunta ko mugunta, amma yana nufin yanayin mulkinsa mai ban tsoro da ban tsoro. A cikin Ingilishi na zamani, “mummunan” sau da yawa yana ɗauke da ma’ana mara kyau, amma a wannan yanayin, ana iya fassara shi da “mai girma,” “mai ban tsoro,” ko kuma “mai ƙarfi.”