The Epistles of Innocent III. are a rich fund for the ecclesiastical and civil institution of the Latin empire of Constantinople; and the most important of these epistles (of which the collection in 2 vols. in folio is published by Stephen Baluze) are inserted in his Gesta, in Muratori, Script. Rerum Italicarum,, tom. iii. p. l. c. 94 - 105.