キクユ族
Koigi's father, "Wamwere", hailed from Kiambu District. However, in 1915, the British colonial government declared that all land in Kenya belong to the settlers. As a result, several Kikuyu people had their land taken away. Koigi's father (then aged 4) and his family were among the evicted and had to move to Rift Valley Province, an area traditionally inhabited by Maasai people. Koigi's mother "Wangu", escaped a forced marriage and ended up in Rift Valley, only to be forcefully married with his father. They had nine children, Koigi being the oldest. Koigi's father worked for the colonial forest department.