Nicene and Post-Nicene Fathers: Series II/Volume XII/Leo the Great/Letters/Letters 62-64
(Letters LXII., LXIII., LXIV., are the Emperor Theodosius’ answers (a) to Valentinian, (b) to Galla Placidia, and (c) to Licinia Eudoxia (assuring them of his orthodoxy and care for the Faith.)