or HILARIA'NUS, Q. JU'LIUS, an ecclesiastical writer belonging to the close of the fourth century, of whose history we know nothing since his works convey no information upon the subject, and he is not mentioned by any ancient authority whatever.
Two works bear the name of Hilarius.
de Die Paschae et Mensis, on the determination of Easter, finished, as we are told in the concluding paragraph, on the fifth of March, A. D. 397.
It was first published from a MS. in the Royal Library at Turin, by C. M. Pfaff, and attached to the edition of the Divine Institutions of Lactantius, printed at Paris in 1712.
It will be found under its most correct form in the Bibliotheca Patrum
of Galland, vol. viii. Append. ii. p. 745. Venet. fol. 1772.
De Mundi Duratione,
or, according to a Vienna MS., De Cursu Temporum,
composed, as we learn from the commencement, after the piece noticed above.
De Mundi Duratione
was first published by Pithou in the appendix to the Bibliotheca Patrum,
printed at Paris in 1579.
It was inserted also in the subsequent edition of the same collection, in many similar compilations, and appears under its best form in the Bibliotheca Patrum
of Galland, vol. viii. p. 235.
Another work thought to be by Hilarius
With regard to the title of another work supposed to have been written by the same author, see Mansius, ad Fabr. Bibl. M. et Inf. Lat.
vol. iii. p. 251.