Maundy Thursday commemorates the events of the night before Christ's crucifixion: the Last Supper, the institution of the Eucharist, the washing of the disciples' feet, and the agony in Gethsemane. The name 'Maundy' derives from the Latin mandatum novum — 'a new commandment' — from John 13:34, spoken after Jesus washed his disciples' feet. The earliest evidence of a distinct liturgical observance on this day comes from the late fourth century. The pilgrim Egeria, writing around 384, describes elaborate Jerusalem services including an afternoon Eucharist at the Martyrium basilica and an evening station at the Imbomon (the traditional site of Jesus's teaching on the Mount of Olives), concluding with a nighttime procession to Gethsemane. By the time of the Apostolic Constitutions (c. 380), the day was established as a fast day. Augustine of Hippo (Ep. 54, to Januarius) attests that by around 400 the day was celebrated with both a morning and evening Eucharist — the evening celebration deliberately recalling the hour of the Last Supper. The foot-washing ceremony (mandatum or pedilavium) became a standard Western liturgical practice by the early medieval period. The seventh-century Ordo Romanus documents the stripping of altars, and the Gelasian Sacramentary provides proper prayers for the day. The Eastern churches developed the day under the name 'Holy and Great Thursday,' with emphasis on both the Last Supper and the Passion beginning at Gethsemane.

The liturgical customs of Maundy Thursday are among the richest in the Christian year. The stripping of the altar after the evening Eucharist — removing cloths, candles, and ornaments to leave the sanctuary bare — dramatically enacts the desolation of Gethsemane and the abandonment of Christ by his disciples. This practice is attested from at least the seventh century (Ordo Romanus) and may be older. The washing of feet, whether performed by the presider on members of the congregation or as a mutual act, recovers the dominical command of John 13 and has been practiced in both East and West, though with varying emphasis — in England, the monarch's participation in the Royal Maundy is documented from the thirteenth century. The reservation of the Blessed Sacrament and the watch before the altar of repose recall Christ's words in Gethsemane: 'Could you not watch with me one hour?' (Matthew 26:40). The Tenebrae office — a service of progressive darkness in which candles are extinguished one by one — is historically associated with the Triduum evenings, and the BCP 2019 provides for it on this night. The evening marks the beginning of the Paschal Triduum — the three-day liturgy spanning Thursday evening through Easter Day that forms the single most important liturgical event of the Christian year. The collect focuses on the institution of the Eucharist specifically, grounding the day's devotion in sacramental theology: what was given on this night continues to be received at every celebration of the Lord's Supper.

Charles Henry Brent was born in 1862 in Canada and ordained to the Episcopal priesthood. Recognizing the spiritual needs of colonial subjects in the newly acquired Philippines, he accepted appointment as Bishop of the Philippines in 1901, where he served for 17 years. During his Philippine episcopate, Brent developed a worldwide vision for Christian unity, becoming convinced that the divisions between Christian denominations were a scandal that hindered Christian witness. In 1910, while attending the Edinburgh Missionary Conference, Brent proposed the creation of a new movement dedicated to restoring communion between separated Christian bodies through theological dialogue. This initiative became the Faith and Order movement, which he chaired for the remainder of his life. The first official Faith and Order Conference convened in Lausanne in 1927, representing a watershed moment in the modern ecumenical movement. Brent served as Bishop of Western New York from 1918 onwards and during World War I was appointed Chief of Chaplains for the American Expeditionary Forces, a role in which he advocated for pastoral care and spiritual resources for soldiers. He was also a passionate advocate for international narcotics control and social reform. He died on March 29, 1929, leaving behind the Faith and Order movement as his primary legacy to the modern church.

Brent is honored as one of the founding fathers of the modern ecumenical movement. His conviction that Christian unity should be pursued through theological dialogue rather than organizational merger established the Faith and Order methodology, which remains central to ecumenical work. He exemplifies the Anglican conviction that visible church unity is both theologically necessary and practically achievable. His legacy includes the continuing work of Faith and Order commissions within the World Council of Churches.