The Congregation of the Sisters of St. Michael the Archangel was founded by Most Rev. Dr. Michael Olatunji Fagun, the then Catholic Bishop of Ekiti on the 6th of November 1986. The reason for the foundation of the Sisters of St. Michael the Archangel are twofold: first, they are  for evangelization through enculturation as the best missionary to evangelize a people are those with full knowledge and cultural background of the evangelized; second, they are to bring the faith into the fibre of the people’s existence so as to form the fabric of their life, with the faith well woven into their culture, from where a new Christian culture would emerge.
The Congregation began with 10 indigenes as the foundation members with the responsibility of formation reposed on the congregation of the Eucharistic Heart of Jesus sisters because of the cultural affiliation. This was successfully accomplished under the guidance and supervision of Rev. Mother Mary Clare Idahosa, who diligently provided personnel for formation. The postulate and Novitiates are both situated in Maria Assumpta Hospital premises in Catholic Diocese of Ekiti, Ado Ekiti, Ekiti State, Nigeria.The Generalate is situated beside St. Fidelis Catholic Church, Ado Ekiti.
 The first General Chapter of the congregation took place in 1995 at Saints Peter and Paul Major Seminary where the first Superior General Sr. Catherine Ajoke Oluyemo was elected with others as counselor, their tenure was five years. Within those five years, on the 22nd of February 1999 the Congregation was canonically erected at St. Patrick’s Cathedral Ado Ekiti by the Father Founder and the Metropolitan Archbishop of Ibadan province, Archbishop Felix Alaba Job after a Canonical approval from the Institute of Consecrated and Apostolic Life in Rome. This has been followed by another three very successful chapters.
Within twenty five years we have witnessed a tremendous growth in every aspect of our existence. 
We have been blessed with a group of lay people who share our life and spirituality and who also support the mission, apostolate and the activity of the Congregation. They are called the Michaelian family.
The Sisters of St. Michael the Archangel are a female religious congregation of Diocesan right with active Spirituality. Our primary aim is to bring the good news to the people (Evangelization) and to support our work with prayer.
To implant Godliness in human beings in an intimate way such that the faith take firm root in people's culture and daily experience.
Evangelization through Inculturation, that is to preach the gospel in such a way that it becomes part of the people's culture.