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 The Ainu reportedly had a red skin tone and their men wore beards
Abraham was the son of Terah (Tera). Terah is a title that indicates a priest among the Ainu of Hokkaido and Okinawa and among Abraham's proto-Saharan Nilotic ancestors. The title was found among the rulers of the Annu rulers who inhabited the Upper Nile and migrated widely between 15,000 and 10,000 years ago. Ainu sometimes appears in ancient texts as Anu, Annu or Hannu.  The Ainu were originally a Nilotic people.

Terah was apparently an Ainu priest and a descendant of Nimrod. The title Tera-neter means priest of God. The top notch at the front of the head gear shown in this image is like that found on the head wear of Ainu elders in Hokkiado and identical to that worn by the Ainu elder of Estern Canada. (See those images here.)

[link to biblicalanthropology.blogspot.com]