The Luo, (also spelled Lwo) are several ethnically and linguistically related Nilo-Semitic ethnic groups that inhabit an area ranging from Egypt and Sudan to South Sudan and Ethiopia, through Northern Uganda and eastern Congo (DRC), into western Kenya, and the Mara Region of Tanzania. Their Luo languages belong to the western branch of the Nilotic language family.
The Luo groups in South Sudan include the Shilluk, Anuak, Pari, Acholi, Balanda Boor, Thuri and Luwo. Those in Uganda include the Alur, Acholi, Jonam and Padhola. The ones in Kenya and Tanzania are the Joluo (also called Luo in Kenyan English).
The Joluo and their language Dholuo are also known as the "Luo proper" by Kenya based observers, even though their dialect has more Bantu loan words than the rest. The level of historical separation between these groups is estimated at about eight centuries. Dispersion from an alleged Nilotic core region in South Sudan is presumed to have been triggered by the turmoil of the Muslim conquest of Sudan. The migration of individual groups over the last few centuries can to some extent be traced in the respective group's oral history.
Origins in South Sudan
The Luo are part of the Nilotic group of people. The Nilotes had separated from the other members of the East Sudanic family by about the 3rd millennium BC. Within Nilotic, Luo forms part of the Western group.
Within Luo, a Northern and a Southern group is distinguished. Dholuo is part of the Southern Luo group. Northern Luo is mostly spoken in South Sudan, while Southern Luo groups migrated south from the Bahr el Ghazal area in the early centuries of the second millennium AD (about eight hundred years ago).
A further division within the Northern Luo is recorded in a "widespread tradition" in Luo oral history: the foundational figure of the Shilluk (or Chollo) nation was a chief named Nyikango, dated to about the mid-15th century. After a quarrel with his brother, he moved northward along the Nile and established a feudal society. The Pari people descend from the group that rejected Nyikango.
Ethiopia
The Anuak are a Luo people whose villages are scattered along the banks and rivers of the southwestern area of Ethiopia, with others living directly across the border in South Sudan. The name of these people is also spelled Anyuak, Agnwak, and Anywaa. The Anuak of South Sudan lives in a grassy region that is flat and virtually treeless. During the rainy season, this area floods, so that much of it becomes swampland with various channels of deep water running through it.
The Anuak who live in the lowlands of Gambela are Luo people. These have accused the current Ethiopian government of encroachment. The government's oppression has affected the Anuak's access to education, health care, and other basic services, as well as limiting opportunities for the development of the area.
The Acholi also spelt Acoli, another Luo people in South Sudan, occupy what is now called Magwi County in Eastern Equatorial State. They border the Uganda Acoli of Northern Uganda. The South Sudan Acholi numbered about 10,000 on the 2008 population Census.
Uganda
In the 1500s, a small group of Luo known as the Biito-Luo (Paluo), led by Labongo encountered Bantu-speaking peoples living in the area of Bunyoro. These Luo settled with the Bantu and established the Babiito dynasty, replacing the Bachwezi dynasty of the Empire of Kitara. According to the legends, Isingoma Mpuga Rukidi (Grandson to Labongo), the first in the line of the Babiito kings of Bunyoro-Kitara, was the twin brother of Kato Kimera, the first king of Buganda. These Luo were assimilated into the Bantu's society and lost their language and culture.
Later in the 18th century, other Luo-speaking people moved to the area that encompasses present-day South Sudan, Northern Uganda, and North-Eastern Congo (DRC) – forming the Alur, Jonam and Acholi.
Between the middle of the 16th century and the beginning of the 17th century, some Luo groups proceeded eastwards. One group called Padhola (or Jopadhola - people of Adhola), led by a chief called Adhola, settled in Budama in Eastern Uganda. They settled in a thickly forested area as a defence against attacks from Bantu neighbours who had already settled there. This self-imposed isolation helped them maintain their language and culture amidst Bantu and Ateker communities.