Transiturus de hoc mundo is the incipit of the papal bull issued on 11 August 1264 by Pope Urban IV in which the feast of Corpus Christi (festum corporis) was declared throughout the entire Latin Rite. This was the very first papally sanctioned universal feast in the history of the Latin Rite.
Thomas Aquinas contributed substantially to the bull, mostly in parts concerned with the liturgical text the new feast. Aquinas composed the sequence Tantum ergo sacramentum 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 at the Council of Vienne.
- Transiturus de hoc mundo ad patrem saluator dominus noster Iesus Christus "As he was about to pass on from this world to the father, our lord saviour Jesus Christ", referring to the Last Supper.
- The Feast of Corpus Christi by Barbara R. Walters, published by Penn State Press, 2007 ISBN 0-271-02924-2 page 12
- Oxford history of Christian worship By Geoffrey Wainwright, Oxford University Press 2006 ISBN 0-19-513886-4, page 248
- Johann Karl Ludwig Gieseler, Francis Cunningham (trans.), Text-book of Ecclesiastical History, volume 2 (1836), p. 338.
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