Peter Julian Eymard was a French Catholic priest and founder of two religious institutes: the Congregation of the Blessed Sacrament for men and the Servants of the Blessed Sacrament for women.

The Congregation of the Blessed Sacrament, commonly known as the Sacramentinos is a Catholic Clerical Religious Congregation of Pontifical Right for men founded by St. Pierre-Julien Eymard. Its members use the nominal letters S.S.S. which is the acronym of its official name in Latin, after their names. By their life and activities, they assist the Church in her efforts to form Christian communities whose center of life is the Eucharist. They commit themselves to the implementation of this ideal in collaboration with lay men and women engaged in various ministries.