It is believed that Dinka (Jieeng) and Nuer (Naath) tribes of South Sudan are brothers from one mother and one father called Dengdit. Jieeng being the sons of Nyanrup Deng and Naath sons of Nyantoch Deng.
In Dinak, Nuer people are being referred as Pan-Nyantooch as Nuer refers Dnka people as Gat-Nyanruop. According to traditional historians, the two had misunderstanding and disagreed in hunting ground.
Nyanrup is a female name given to girl born in woodland boarding plain or a group of trees close together. While Nyantooc is a female name given to girl born in plain or Swamp areas.
Up to now now Dinka and Nuer call themselves Gat-mallen meaning son of my aunt
Dengdit in Jieeng is ancestor of the Jang and Jieng tribes and worshipped. Believed to have been taken to heaven during a storm. There are other minor ancestors of clans of the same name.
Dinka, also called Jieng, one of largest tribes in South Sudan and African, they live in the savanna country surrounding the central swamps of the Nile basin primarily in South Sudan. They speak a Nilotic language classified within the Eastern Sudanic branch of the Nilo-Saharan languages and are closely related to the Nuer.
The Nuer people are a Nilotic ethnic group primarily inhabiting the Nile Valley. They are concentrated in South Sudan, with some also found in southwestern Ethiopia. They speak the Nuer language, which belongs to the Nilo-Saharan family.
The Atuot (Reel) are a Nilotic ethnic group of South Sudan who live near Yirol in Eastern Lakes State. They comprise a majority of the population in the payam of Yirol West.
Three “brothers”—Nuer, Dinka, and Atuot—once lived in a neighboring territory. Legends suggest that they parted company to go their own ways following a dispute about the rightful ownership of a number of cattle.
Both Atuot and Nuer traditions indicate that this separation and initial migration originated in a cattle camp in what is now termed western “Nuerland.”
These legends of migration sometimes have mythical properties, but it is prudent to appreciate them also for their historical character.
It is certain that the Nuer, Dinka, and Atuot have a common “origin,” and archaeological research may indicate that the spread of domesticated cattle in this region of Africa was contemporaneous with the origin of distinct ethnic identities.
An especially active period of Nuer eastward migration began in the middle of the nineteenth century.
Beginning at the turn of the twentieth century, British colonial policy in Nuerland was aimed at fixing boundaries between the Nuer and the Dinka, thus effectively halting a dynamic process of cultural change that had been unfolding for centuries.