Of Constantine's Oration which he wrote to the Assembly of the Saints
The emperor was in the habit of composing his orations in the Latin tongue, from which they were translated into Greek by interpreters appointed for this special service. One of the discourses thus translated I intend to annex, by way of specimen, to this present work, that one, I mean, which he inscribed “To the assembly of the saints,” and dedicated to the Church of God, that no one may have ground for deeming my testimony on this head mere empty praise.
Source: Life of Constantine (New Advent)