Intef III was the son of his predecessor Intef II. This is indicated by the stela of Tjeti, chief treasurer during the reigns of Intef II and Intef III. Tjeti's stele mentions the death of Intef II and goes on describing how Tjeti served Intef II's son who acceded to the throne upon the death of his father: : Then, when his
son assumed his place, Horus, Nakht-neb-Tepnefer, King of Upper and Lower Egypt, Son of Re, Intef, fashioner of beauty, living like Re, forever, I followed him to all his good seats of pleasure. Intef III possibly married his sister
Iah, described as a ''king's mother
(mwt-nswt
), king's daughter
(sȝt-nswt
) and priestess of Hathor (ḥmt-nṯr-ḥwt-ḥr''). This indicates that Intef III's successor, Mentuhotep II, was his son. This is further confirmed by the stele of Henenu (Cairo 36346), an official who served under Intef II, Intef III and his "son", which the stele identifies as Horus Sankhibtawy (
s-ˁnḫ-[jb-tȝwy]), Mentuhotep II's first
Horus name. Another piece of evidence for this parentage is a relief on the
Gebel el-Silsileh in the Wadi Shatt er-Rigal, known as the Silsileh petroglyph, depicting Mentuhotep II surrounded by Iah and Intef III. This establishes that she was Intef III's daughter and the sister of Mentuhotep II. ==Reign==