The Feast of Corpus Christi (Ecclesiastical Latin: Dies Sanctissimi Corporis et Sanguinis Domini Iesu Christi, lit. 'Day of the Most Holy Body and Blood of Jesus Christ the Lord'), also known as the Solemnity of the Most Holy Body and Blood of Christ, is a Roman Catholic, Anglican, and Western Orthodox liturgical solemnity celebrating the Real Presence of the Body and Blood, Soul and Divinity of Jesus Christ in the elements of the Eucharist. Two months earlier, the institution of the Eucharist at the Last Supper is observed on Maundy Thursday in a sombre atmosphere leading to Good Friday. The liturgy on that day also commemorates Christ's washing of the disciples' feet, the institution of the priesthood, and the agony in the Garden of Gethsemane.
The feast of Corpus Christi was proposed by Thomas Aquinas, Doctor of the Church, to Pope Urban IV, in order to create a feast focused solely on the Holy Eucharist, emphasizing the joy of the Eucharist being the Body and Blood, Soul and Divinity of Jesus Christ. Having recognized in 1264 the authenticity of the Eucharistic Miracle of Bolsena, on input of Aquinas, the pontiff, then living in Orvieto, established the feast of Corpus Christi as a Solemnity and extended it to the whole Roman Catholic Church.