The Kikuyu (also Agĩkũyũ/Gĩkũyũ) are a Bantu ethnic group native to Central Kenya. At a population of 8,148,668 as of 2019, they account for 17.13% of the total population of Kenya, making them Kenya's largest ethnic group.
The term Kikuyu is the Swahili borrowing of the autonym Gĩkũyũ (ɣèkòjóꜜ)
The Kikuyu belong to the Northeastern Bantu branch. Their language is most closely related to that of the Embu and Mbeere. Geographically, they are concentrated in the vicinity of Mount Kenya.
The exact place that the Northeast Bantu speakers migrated from after the initial Bantu expansion is uncertain. Some authorities suggest that the Kikuyu arrived in their present Mount Kenya area of habitation from earlier settlements further to the north and east, while others argue that the Kikuyu, along with their closely related Eastern Bantu neighbours the Embu, Meru, Mbeere, and Kamba moved into Kenya from points further north.
From archaeological evidence, their arrival at the northern side of Mt. Kenya dates to around the 3rd century, as part of the larger group known as Thagicu. By the 6th century, there was a community of Agikuyu newly established at Gatung'ang'a in Nyeri. The Agikuyu established themselves in their current homeland of Mt. Kenya region by the 13th century.
Before the establishment of East Africa Protectorate in 1895, the Agĩkũyũ preserved geographic and political power from almost all external influence for many generations; they had never been subdued. Before the arrival of the British, Arabs involved in slave trading and their caravans passed at the southern edges of the Agĩkũyũ nation. Slavery as an institution did not exist amongst the Agĩkũyũ, nor did they make raids for the capture of slaves. The Arabs who tried to venture into Agĩkũyũ land met instant death. Relying on a combination of land purchases, blood-brotherhood (partnerships), intermarriage with other people, and their adoption and absorption, the Agĩkũyũ were in a constant state of territorial expansion. Economically, the Agĩkũyũ were great farmers and shrewd businesspeople.