''Transiturus de hoc mundo'' is the papal bull issued on 11 August 1264 by

Pope Urban IV Pope Urban IV ( la, Urbanus IV; c. 1195 – 2 October 1264), born Jacques Pantaléon, was the head of the Catholic Church and ruler of the Papal States from 29 August 1261 to his death. He was not a cardinal; only a few popes since his time ha ...

in which the

feast of Corpus Christi The Feast of Corpus Christi (), also known as the Solemnity of the Most Holy Body and Blood of Christ, is a Christian liturgical solemnity celebrating the Real Presence of the Body and Blood, Soul and Divinity of Jesus Christ in the elements of ...

(''festum corporis'') was declared throughout the entire

Latin Church , native_name_lang = la , image = San Giovanni in Laterano - Rome.jpg , imagewidth = 250px , alt = Façade of the Archbasilica of St. John in Lateran , caption = Archbasilica of Saint Joh ...

. This was the first papally sanctioned universal feast in the history of the Latin Church.

Thomas Aquinas Thomas Aquinas, OP (; it, Tommaso d'Aquino, lit=Thomas of Aquino; 1225 – 7 March 1274) was an Italian Dominican friar and priest who was an influential philosopher, theologian and jurist in the tradition of scholasticism; he is known wi ...

contributed substantially to the bull, mostly in parts concerned with the liturgical text of the new feast. Thomas composed the sequence ''

Tantum ergo sacramentum "Tantum ergo" is the incipit of the last two verses of Pange lingua, a Medieval Latin hymn generally attributed to St Thomas Aquinas c. 1264, but based by Aquinas upon various earlier fragments. The "Genitori genitoque" and "Procedenti ab utroque" ...

'' for this purpose. The successors of Urban IV did not uphold the decree, and the feast was suspended until 1311, when it was reintroduced by

Clement V Pope Clement V ( la, Clemens Quintus; c. 1264 – 20 April 1314), born Raymond Bertrand de Got (also occasionally spelled ''de Guoth'' and ''de Goth''), was head of the Catholic Church and ruler of the Papal States from 5 June 1305 to his de ...

at the

Council of Vienne The Council of Vienne was the fifteenth ecumenical council of the Roman Catholic Church and met between 1311 and 1312 in Vienne, France. One of its principal acts was to withdraw papal support for the Knights Templar at the instigation of Phili ...

.Johann Karl Ludwig Gieseler, Francis Cunningham (trans.), ''Text-book of Ecclesiastical History'', volume 2 (1836)
p. 338

References

Documents of Pope Urban IV 1264 {{RC-document-stub