Amongst the homilies ascribed to Proclus, one-time bishop designate of Cyzicus and later bishop of Constantinople (434–46), there is included one of which the subject is the Ascension of Christ. The first section of this sermon was transcribed, with the omission of a few sentences, by Photius in his Bibliotheca; he assigned it, however, not to Proclus but to Nilus, an ex-Prefect of Constantinople who had embraced the monastic life and retired to the deserts of Sinai in the first decade of the fourth century. The problem of authorship thus presented can only be determined upon internal evidence, since no other references to this sermon have been preserved.