According to Bron, the author of this inscription is Ydʿʾl Ḏrḥ bn S¹mhʿly mkrb S¹bʾ, who would be the king of one of the Glaser inscriptions (Gl 1122-1116-1120, 1123-1124-1125).
Bron, François 1992. Mémorial Mahmud al-Ghul. Inscriptions sudarabiques. Paris: Librairie orientaliste Paul Geuthner / Sanʿāʾ: Centre français d'études yéménites.