Semenkare

Attestation The Sinai The only contemporary attestation of Nebnuni is a faience stele showing the king before Ptah "South of his wall", a memphite epithet of the god, and on the other before Horus, "Lord of the foreign countries". The stele is also inscribed with Nebnuni's nomen and prenomen. The stele was discovered at Gebel el-Zeit on the Red Sea coast in the Sinai, where mines of galena were located.

Non-contemporary attestation The Turin canon 7:11 (Gardiner 6:11) mentions: "The Dual King Semenkara ... 22 days ...". Alternatively, Jürgen von Beckerath and Detlef Franke see him as the eighth king of the dynasty.

The Egyptologist Kim Ryholt credits Nebnuni with a reign of two years, from 1785 BC until 1783 BC. Alternatively, Egyptologists Rolf Krauss, Detlef Franke and Thomas Schneider give Nebuni only one year of reign in 1739 BC. Although little is known of Nebnuni's reign, the existence of his stele shows that during this period, rulers of the 13th Dynasty still wielded sufficient power to organize mining expeditions in the Sinai for the supply of construction materials and the production of luxury items. Finally, Ryholt points to the lack of royal connections between Nebnuni and his predecessor. He thus concludes that Nebnuni may have usurped the throne.