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.

[1] Although Intef III's name is lost in a lacuna of the Turin canon, a king list compiled in the early Ramesside period, its reign length is still readable on column 5, row 15,[15] and given as 8 years.

A doorjamb bearing Intef III's name was uncovered on Elephantine in the sanctuary of Hekayeb, a deified nomarch of the 6th Dynasty, which shows that he must have ordered work there.

[8] Coordinates: 25°44′12″N 32°38′11″E / 25.73667°N 32.63639°E / 25.73667; 32.63639 The necropolis of the kings of the 11th Dynasty is located in El-Tarif, on the opposite bank of the Nile from Thebes.

Several saff-tombs of imposing dimensions are found there but, until the excavations of the German Archaeological Institute under the direction of Dieter Arnold from 1970 until 1974, it was unclear to whom some of these tombs belonged.

In spite of the ruined state of the tomb, the 1970s excavations have shown that its walls must once have been lined with sandstone and adorned with decorations.