Also , the title was created when it became evident that Queen Victoria 's daughter , Victoria , Princess Royal , would become an empress when her husband ascended the German imperial throne , many people thought it was wrong for the daughter to be an empress while her mother was just a Queen . It had become evident that Queen Victoria 's daughter , Victoria , Princess Royal , would become an empress when her husband ascended the German imperial throne ; many at the time thought it wrong for the daughter to outrank her mother , a `` mere '' queen .