The Feast of Corpus Christi, or the Feast of the Body and Blood of Christ (as it is often called today), goes back to the 13th century, but it celebrates something far older: the institution of the Sacrament of Holy Communion at the Last Supper. While Holy Thursday is also a celebration of this mystery, the solemn nature of Holy Week, and the focus on Christ’s Passion on Good Friday, overshadows that aspect of Holy Thursday.
More at Corpus Christi (ThoughtCo)
Image: Pope Francis elevates the Eucharist as he celebrates Mass on the feast of Corpus Christi outside the Basilica of St. John Lateran in Rome. (CNS photo/Paul Haring)