Note 47 — INTRODUCTION TO THE STUDY OF EGYPTIAN SEALS.
Reading edition
The earliest instance of this title that I know of occurs at Shût er Rigal, in the scene of King Antef (Eleventh Dynasty) before Neb-kheru-Ra Mentu-hetep: here the mer khetem stands immediately behind his sovereign Antef. The title also occurs in a tomb at Kasr es Sayyad, the date of which may be perhaps a little earlier than the Shût er Rigal graffito.