[597] Opera S. Leonis I.; Migne, Patr. Lat., lv. 57; lxxiv. 1168 under No. 33.
[598] Beleth, Rationale Div. Off. c. 124; Migne, Patr. Lat., ccii. 131.
[599] Socr., Hist. Eccl., i. 16: μνήμη τῶν ἀποστόλων.
[600] Euseb., Vita Const., 4, 71.
[601] Theophanes, Nicephorus, etc. Muralt, Chron. Byz., i. 197.
[602] Edited in Greek by Usener in the Bonn Lektionskatalog for 1877.
[603] Duchesne, Origines, 255.
[604] Gregor, Nyss. Opera; Migne, Patr. Gr., xlvi. 725, 787.
[605] Ambros., De Virg. c. 19, No. 124: “Dies factus est Petrus, dies Paulus ideoque hodie natali eorum Spiritus Sanctus increpuit dicens, etc.” Migne, Patr. Lat., xvi. 299.
[606] Hom., 68-73 and Sermo, 66-69; Migne, Patr. Lat., lvii.