On June 6, Catholics celebrate the Solemnity of the Most Holy Body and Blood of Christ, popularly known as Corpus Christi.
Originally celebrated on the Thursday after Trinity Sunday, in most places today it is observed the following Sunday. This feast celebrates the great gift of the Real Presence of Christ in the Eucharist in the life of the Church.
First observed locally in northern France and what is now Belgium in the 1240s, Pope Urban VI extended this feast to the universal Church in 1264 at the urging of St. Thomas Aquinas. However, this mystery was already central to the spirituality of Francis of Assisi.
On this point, see the enlightening column below by George Corrigan, OFM.
Dominic V. Monti, OFM, is a Franciscan Friar of Holy Name Province (USA) and currently professor of Franciscan Research in the Franciscan Institute of St. Bonaventure University. He devoted the greater part of his ministry to teaching the History of Christianity, in particular the history of the Franciscan movement. He has contributed two volumes to the Works of St. Bonaventure series and is author of Francis & His Brothers, a popular history of the Friars Minor.