Imperial Majesty (His/Her Imperial Majesty, abbreviated as HIM) is a style used by emperors and empresses. It distinguishes the status of an emperor/empress from that of a king/queen, who are simply styled Majesty (HM). Holders of this style have sometimes been observed to follow religious leaders who are styled "His Holiness" in public ceremonies.
King-Emperors and Queen-Empresses sometimes have used the style Imperial and Royal Majesty (e.g. The Empress Frederick's style Her Imperial and Royal Majesty The German Empress and Queen of Prussia).