The Middle Kingdom is a period in the history of ancient Egypt stretching from the establishment of the Eleventh Dynasty to the end of the Fourteenth Dynasty, roughly between 1991 BC and 1648 BC.
The Middle Kingdom has been usually dated to the time when Pharaoh Mentuhotep II from Thebes defeated the last king of the Tenth Dynasty around the 14th Year of his reign to reunite Egypt thus bringing an end to the First Intermediate Period. Some authorities point to cultural differences between the Eleventh and Twelfth Dynasties, and date the Middle Kingdom to the beginning of that dynasty.
He was the first ruler of the Middle Kingdom.
His throne name was Neb-hetep-re, meaning "Pleased is the Lord Re".
Mentuhotep II was the son of the Theban ruler Antef III and a woman named Iah. When he came to power, his predecessors had already conquered a territory that stretched far beyond Thebes, from the 1st cataract in the south, to the region of Qaw el-Kabir in the north.
The Turin King-lists credits this king with a reign of as much as 51 years. In light of the many events that occurred during his reign, this is not unlikely.
Mentuhotep II was responsible for the reunification of Egypt.
His achievements can be reviewed by looking at how his Horus name changed during his rule. He started off calling himself "He who gives heart to the Two Lands", and then moved on to "Lord of the White Crown" (the White Crown being symbolic of Upper Egypt). Finally, he became known as "Uniter of the Two Lands".
The first years of his reign have left us with only few testimonies. This could mean that he reached the throne at a young age, something that is also suggested by the long duration of his reign. His 14th regnal year was apparently a turning-point in the life of Mentuhotep. Its name "year of the crime of Thinis" suggests that there was some trouble in the Thinite province, where the age-old holy city of Abydos was located. Apparently the Heracleopolitan king Kheti of the 9/10th Dynasty had succeeded in re-conquering this province and was threatening to do the same with the rest of Upper-Egypt. During this re-conquest, a large part of the old necropolis of Abydos was destroyed.
Mentuhotep immediately reacted and not only repelled the Heracleopolitans from Abydos, he also continued the war against them, conquering Assiut, Middle-Egypt and finally Heracleopolis itself. With the fall of the Heracleopolitan Dynasty, nothing stood in the way for the final re-unification of Egypt under Theban rule.
At the latest by his 39th year, but presumably somewhere around his 30th year, Egypt was united again and Mentuhotep II was the first Theban who could rightfully call himself King of Upper- and Lower-Egypt thus ushering in the Middle Kingdom.
Mentuhotep's military efforts were not only aimed at reuniting the Two Lands. Inscriptions in Nubia show his desire to re-establish the Egyptian supremacy over this region. A mass-tomb found in Deir el-Bahari contained 60 bodies of slain Egyptian soldiers who perhaps lost their lives in Nubia. That these soldiers were given a burial so near the king's own funerary monument, demonstrates how much importance was attached to them.
Even during the re-conquest of Egypt, Mentuhotep built or restored several temples throughout his territory. He was particularly active in Upper-Egypt as is shown by monuments in Dendara, Abydos, Elkab and Elephantine. The warrior-king paid special homage to the war-god Montu, who, at that time, was the principal god of the Theban province. For him he built temples in Medamud, Armant and Tod.

A view on the remains of Mentuhotep's funerary temple (foreground). The larger building in the background is Hatshepsut's temple, the design of which was largely based on Mentuhotep's.
The most famous monument built by Mentuhotep II was his funerary monument. Unlike his predecessors, who were buried in relatively simple tombs in Dra Abu el-Naga', Mentuhotep chose to build his mortuary temple and tomb at Deir el-Bahari. The design of this building was unique: a terrace was built against the cliffs of Deir el-Bahari. Upon the roof of that terrace was built a massive stone construction, identified by some archaeologists as a pyramid, by others as a mastaba. The tomb of the king was located in the rock behind and underneath the temple.
Mentuhotep III was the son and successor of Mentuhotep II. He is attested as "eldest son of the king" in his father's mortuary temple in Deir el-Bahari.
Because of his father's long reign, he may already have been relatively old by the time he reached the throne. The Turin King-list has recorded 12 years for this king.
After the military reign of his father, Mentuhotep III's reign was peaceful. The king's main concern was no longer the conquest of new territory, but the protection of Egypt against foreign states and roaming Bedouin. The cult for this Mentuhotep in the eastern Delta is probably related to his policy to fortify the north-eastern border against the Asian nomads.
The most important event during this king's reign was an expedition, led by a man named Henenu, through the Wadi Hammamat to the Red Sea and from there to the legendary land of Punt, from where many exotic products and incense were brought to Egypt.
Despite its relatively short duration, this reign has produced several temples throughout Upper-Egypt, from the southern most border in Elephantine, over Elkab, Tod and Armant to Abydos, as evidenced by a relief found in Armant.
A tomb was apparently started for this king, near Deir el-Bahari, but it was left unfinished.
Mentuhotep IV was the last king of the 11th Dynasty. He was the son of a woman named Imi, who was a secondary wife of either Mentuhotep II or Mentuhotep III.
This Mentuhotep is missing in most king-lists. The Turin-king-list merely notes 7 missing years at the end of this dynasty, just after the reign of Mentuhotep III. This probably refers to a gap in the documentation of about 7 years, which may have been filled by Nebtawire's reign. An offering table found in Karnak mentions the "Father of the God" Sesostris, the father of Amenemhat I, the founder of the next dynasty, in his place.
Either Mentuhotep IV was considered as an usurper, or the kings of the 12th Dynasty decided to re-write history to justify their claims to the throne. That he was not recognised as the legitimate king of the country may perhaps be supported by the many opponents to his reign: Antef, who may have been a member of the royal family, Iy-ib-khent-re and Segerseni all assumed royal titulary, thereby stating that they had more rights to the throne.
During the second year of his reign, he organised an expedition to the quarries of the Wadi Hammamat, located to the north-east of Thebes, between Koptos and the Red Sea. The 19 inscriptions left behind there by the members of the expedition are the only testimony to this Mentuhotep's reign.
The expedition was led by a vizier named Amenemhat, who is assumed by most Egyptologists to have been the later king Amenemhat I. A stone plate found at Lisht, bearing both the names of Mentuhotep IV and of king Amenemhat I may perhaps indicate that Amenemhat I was a co-regent during the later years of Mentuhotep's reign. This in turn could perhaps indicate that Mentuhotep IV had intended Amenemhat to be his successor.
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