Tenth Dynasty of Egypt in the context of "Pepi II Neferkare"

Mentuhotep II (Ancient Egyptian: Mn-ṯw-ḥtp, meaning "Mentu is satisfied"), also known under his prenomen Nebhepetre (Ancient Egyptian: Nb-ḥpt-Rˁ, meaning "The Lord of the rudder is Ra"; died c. 2009 BC), was an ancient Egyptian King, the sixth ruler of the 11th Dynasty. He is credited with reuniting Egypt, thus ending the turbulent First Intermediate Period and becoming the first pharaoh of the Middle Kingdom. He reigned for 51 years, according to the Turin King List. Mentuhotep II succeeded his father Intef III on the throne and was in turn succeeded by his son Mentuhotep III.

Mentuhotep II ascended Egypt's throne in the Upper Egyptian city of Thebes during the First Intermediate Period. Egypt was not unified during this time, and the 10th Dynasty, rival to Mentuhotep's 11th, ruled Lower Egypt from Herakleopolis. After the Herakleopolitan kings desecrated the sacred ancient royal necropolis of Abydos in Upper Egypt in the fourteenth year of Mentuhotep's reign, Pharaoh Mentuhotep II dispatched his armies north to conquer Lower Egypt. Continuing his father Intef III's conquests, Mentuhotep succeeded in unifying his country, probably shortly before his 39th year on the throne. Following and in recognition of the unification, in regnal year 39, he changed his titulary to Sematawy (Ancient Egyptian: Smȝ-tȝ.w(j), meaning "He who unifies the two lands").

The Ninth Dynasty of ancient Egypt (Dynasty IX) is often combined with the 7th, 8th, 10th and early 11th Dynasties under the group title First Intermediate Period.The dynasty that seems to have supplanted the Eighth Dynasty is extremely obscure. The takeover by the rulers of Herakleopolis was violent and is reflected in Manetho's description of Achthoes, the founder of the dynasty, as 'more terrible than his predecessors', who 'wrought evil things for those in all Egypt".

The decans (/ˈdɛkənz/; Ancient Egyptian: 𓅡𓎡𓏏𓁐𓅱𓏼, romanized: bꜣkt.w, lit. '[those] connected with work') are 36 groups of stars (small constellations) used in ancient Egyptian astronomy to conveniently divide the 360 degree ecliptic into 36 parts of 10 degrees each, both for theurgical and heliacal chronometrical purposes. The decans each appeared, geocentrically, to rise consecutively on the horizon throughout each daily Earth rotation. The rising of each decan marked the beginning of a new decanal "hour" (Greek hōra) of the night for the ancient Egyptians, and they were used as a nocturnal (sidereal clock) beginning by at least the Ninth or Tenth Dynasty of Egypt in the 21st century BC.

Because a new decan also appears heliacally every ten days (that is, every ten days, a new decanic star group reappears in the eastern sky at dawn right before the Sun rises, after a period of being obscured by the Sun's light), the Greeks called them dekanói (Koine Greek: δεκανοί; pl. of δεκανός dekanós) or "tenths".

Intef III was the third pharaoh of the Eleventh Dynasty of Egypt during the late First Intermediate Period in the 21st century BC, at a time when Egypt was divided in two kingdoms. The son of his predecessor Intef II and father of his successor Mentuhotep II, Intef III reigned for 8 years over Upper Egypt and extended his domain North against the 10th Dynasty state, perhaps as far north as the 17th nome. He undertook some building activity on Elephantine. Intef III is buried in a large saff tomb at El-Tarif known as Saff el-Barqa.