The Institute of Christ the King, Sovereign Priest is a Society of Apostolic Life of Pontifical Right whose goal is the honor of God and the sanctification of priests in the service of the Church and souls. Its specific aim is missionary: to spread the reign of our Lord Jesus Christ in all spheres of human life. Our work is carried out under the patronage of the Immaculate Conception, to Whom the Institute is consecrated.

 The Institute was founded in 1990 by Monsignor Gilles Wach and Father Philippe Mora in Gabon, Africa, where we still have missions. Today, the motherhouse and international seminary of the Institute is located in Gricigliano, in the Archdiocese of Florence, Italy.

Recognizing the importance of a deep harmony between faith, liturgy, life, and the power of beauty in attracting the human senses to the things above, an integral part of the Institute's charism is the use of the traditional Latin Liturgy of 1962 for the Holy Sacrifice of the Mass and the other sacraments. Great care for a solemn liturgy, complete fidelity to the doctrine of the Church and the Holy Father, and awareness of the central role of Grace, especially Charity — these are essential elements of the Institute's spirituality, which is drawn from its three co-patrons, St. Benedict, St. Thomas Aquinas, and St. Francis de Sales. Our motto, taken from St. Paul, is "Live the truth in charity." The Institute operates in more than fifty places in twelve countries, where our priests focus on the care of souls in many different ways. To assist our priests in their apostolic work, the Institute also has clerical oblates. In 2004, a community of religious sisters was canonically established to aid the priests in their mission through prayer and apostolic work.