Naath/Jieng origin of south sudan,

No doubts , Jieng and Nuer origin is Ancient Egypt or Ancient Kush kingdom or Nubia kingdom.

Nuer and Jieng were part of Nubia people who dispersed into different parts of African continent, the word 'Nubia ' was used by Greek to describe Black people inhabiting Nile valley, and that word is now still used to describe more than 90 tribes who speak different languages living in today's Sudan Nubia mountains.

Jieng and Naath (Nuer) descended from one father and mother, they formed a tribe called koc which established ancient advanced Civilzation called "koc kingdom' [Kush kingdom] which is now modern Egypt and modern Sudan.

After kush kingdom collapsed, koc people (Naath and Jieng) migrated from northern Sudan to central Sudan which is now khartoum, the capital of Sudan.

From khartoum , koc tribe moved to Southern Sudan around 16th century AD and it split into two tribes Jang [Dinka] and Naath[Nuer].

Nuer and Jieng speaks the same language until late 19th century AD when slight changes occurred.

Jieng and Nuer have scars on their foreheads, Nuer scars are horizontal only while Jieng scars are either horizontal or vertical as shown in the picture below.