This paper was extracted from a Master of Arts Degree (History) thesis which was submitted to Graduate School of Kenyatta University in April 2017. The study interrogated the Impact of the Inter-Christian Fellowship Evangelical Mission on circumcision Rituals among the Babukusu of Kimilili Constituency. However, this paper traces the origin and the development of circumcision concepts among Babukusu, emphasizing on age-sets that are closely attached to this initiation ritual. It gives a historical perspective of this rite that has been examined by social Anthropologists. To achieve this, the adoption of interview schedules was very paramount and as such, knowledgeable informants were subjected to Oral Interviews whose data was corroborated with other secondary sources to ascertain relevant historical facts. That aside, significant information was collected from the Kenya National Archives and this was a crucial source towards the development of this paper.