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In page Kikuyu people:

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The Gĩkũyũ were – and still are – monotheists believing in an omnipotent God whom they refer to as Ngai. All of the Gĩkũyũ, Embu, and Kamba use this name. Ngai was also known as Mũrungu by the Meru and Embu tribes, or Mũlungu (a variant of a word meaning God which is found as far south as the Zambezi of Zambia). The title Mwathani or Mwathi (the greatest ruler) comes from the word gwatha meaning to rule or reign with authority, was and is still used. All sacrifices to Ngai were performed under a sycamore tree (Mũkũyũ) and if one was not available, a fig tree (Mũgumo) would be used. The olive tree (Mũtamaiyũ) was a sacred tree for women.[1]