I seriously doubt this.
Egypt, Ancient Thebes, Shaykh 'Abd al-Qurnah, mural painting of nubian mercenaries
Credit:
DEA / M. CARRIERI
Creative #: 82127154
Egypt - Ancient Thebes (UNESCO World Heritage List, 1979). Shaykh 'Abd al-Qurnah (Abd el-Qurna). Tomb of army commander Thanuny. Nubian mercenaries. Mural paintings, 1425-1408 BC
Various
pharaohs of Nubian origin are held by some Egyptologists to have played an important part towards the area in different eras of Egyptian history, particularly the
12th Dynasty. These rulers handled matters in typical Egyptian fashion, reflecting the close cultural influences between the two regions.
...the XIIth Dynasty (1991–1786 B.C.E.) originated from the Aswan region. As expected, strong Nubian features and dark coloring are seen in their sculpture and relief work. This dynasty ranks as among the greatest, whose fame far outlived its actual tenure on the throne. Especially interesting, it was a member of this dynasty that decreed that no Nehsy (riverine Nubian of the principality of
Kush), except such as came for trade or diplomatic reasons, should pass by the Egyptian fortress and cops at the southern end of the Second Nile Cataract. Why would this royal family of Nubian ancestry ban other Nubians from coming into Egyptian territory? Because the Egyptian rulers of Nubian ancestry had become Egyptians culturally; as pharaohs, they exhibited typical Egyptian attitudes and adopted typical Egyptian policies. (Yurco 1989)
[2
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Nubia - Wikipedia, the free encyclopedia
http://library.la84.org/SportsLibrary/JSH/JSH1988/JSH1502/jsh1502b.pdf
This how the people of "Ta Seti depicted themselves.
Modern North Sudanese near Egyptian border, looks exactly like the art work
Indeed southerners were depicted in the ancient art, which is obvious both friend and foe and depends on the group. The were from the mythological people of "Yam", which make sense and it was reported the lived beyond the cataracts.
as far as them being the pyramids builders i seriously doubt that. Maybe they were part of the civilization, but definitely not the main component..Because majority of the the statues in both Egypt and the National museum in Khartoum look most similar to the present population in both North Sudan and Egypt today, but southerners and others were depicted as well.
Cheers