The Comboni Missionaries first arrived in Kenya in August 1972 in Tartar parish (West Pokot). The main reason for opening up missions in Kenya was due to instability in Uganda during the reign of Gen. Idi Amin Dada and the expulsion of some Comboni missionaries from Uganda. Currently the Comboni Missionaries are present in five Dioceses in Kenya: Marsabit, Lodwar, Kitale, Nairobi and Ngong.
The Postulancy is situated in Ongata Rongai (Ngong diocese). This is a booming town of small businesses; it is located at around 25 km. away from Nairobi City centre. In recent years, part of middle-class people have moved from the big city to Ongata Rongai., in this town one can see reproduced in smaller scale the contradictions of Nairobi: beautiful and luxurious flats and the slums of Kware, the extremely rich living side by side with the poor, different religions rubbing each other's shoulders and the melting pot of diverse ethnic groups coming from different parts of the Country and of Africa especially from South Sudan.
The Postulancy started in 1983. It was built within the premises of St. Mary's Catholic parish, which was a Comboni parish till 2007 when it was handed over to the Diocese. In 25th September, 2015, the New Comboni House postulancy was relocated to an area which falls under Fatima Catholic Parish still within Rongai. This new postulancy is jointly co-owned by the provinces of Kenya and Southern Sudan. Since its inception more than 40 people who received their formation in this Postulancy have become Comboni missionaries.
Different formators who have worked here are; Fr. Mario Porto, Fr. A. Solda, Fr. A. Schneider, Fr. Tomas Herreros, Fr. Romeo Di Berti, Fr. Francisco Munguia, Fr. Mariano Tibaldo, Fr. Jesus Aranda, Fr. Bosco Sule Mawa, Fr. Daniel Villaverde, Fr. Jesus Lobato, Fr. Eutiquio Mula Jr, Fr. Andrew Wanjohi, Fr. Phillip Andruga , Fr. Joseph Ngumba Lelo. and currently Fr. Lauro Betancourt Garcia, Fr. David Khayesi Ahiro and Fr. Clement Mbithi.
