4.--Acts of the Councils. See Chap. IX. 5.--_Roman Civil Law._ Various English translations. 6.--_Canon Law._ Various collections. Best by Richter, 2 vols., Leip. 1839. No English translation. 7.--_Apostolical Constitutions._ Various English translations. Best in _Ante-Nic. Christ. Lib._, vol. 17. _Cf._ Harnack, _Sources of the Apostolic Canons_. Lond., 1895. 8.--_Apostolic Canons._ Various English translations. 9.--Leo I., _Epistles to Flavian_. Transl. by C. A. Heurtley. Oxf., 1885. _Letters and Sermons._ _Lib. of Nic. and Post-Nic. Fathers_, xii. 10.--Gregory I., _Book of Pastoral Rule and Selected Epistles_. _Ibid._ Bibliographical note:--Unfortunately the best collections of materials have not been put into English, like: 1.--Mirbt, _Quellen zur Geschichte des Papsttum_. Leipz., 1895. 2.--Hardouin, _Acta Conciliorum_. Paris, 1815. 12 vols. 3.--Mansi, _Collectio Sacrorum Conciliorum_. Flor. & Ven., 1759-98. 31 vols. 4.--Jaffé, _Regesta Pontificum Romanorum_. Leipz., 1881-8. 2 vols. B.--SECONDARY: I.--SPECIAL: 1.--Allies, T. W., _The Holy See from Leo I. to Gregory I._ Lond., 1888. 2.--Balzani, U., _Early Chronicles of Italy_. Lond., 1883; i.-iii. 3.--Barry, W., _The Papal Monarchy_. N. Y., 1901. 4.--Bigg, _Church's Task under the Roman Empire_. Oxf., 1905. 5.--Borrow, I., _The Pope's Supremacy_. New ed. Lond., 1859. 6.--Bower, A., _History of the Popes_. Phil., 1844. 3 vols. 7.--Bright, W., _The Roman See in the Early Church_. Lond., 1890. 8.--Brock, M., _Rome: Pagan and Papal_. Lond., 1883. 9.--Bryce, J., _The Holy Roman Empire_. Many eds. Last ed. Lond. and N. Y., 1904. 10.--Creighton, M., _History of the Papacy_. Bost., 1882-94. Vol. i. 11.--Dudden, _Gregory the Great_. Lond. and N. Y., 1905. 2 vols. 12.--Duff, D., _The Early Church_. N. Y., 1891. 13.--Gasquet, _A Life of Pope Gregory the Great_. Lond., 1904. 14.--Gore, C., _Leo the Great_. Lond., 1878. 15.--Gosselin, J. E., _Power of the Pope during the Middle Ages_. Lond., 1853. 16.--Greenwood, T., _Cathedra Petri_. Lond., 1859-72. Vols. i.-ii. 17.--Hussey, R., _Rise of the Papal Power_. Lond., 1863. 18.--Kellett, F. W., _Pope Gregory the Great and his Relations with Gaul_. N. Y., 1890. 19.--Kenrick, F. P., _The Primacy of the Apostolic See_. 7th ed. Balt., 1855. 20.--Lea, H. C., _Studies in Church History_. Phil., 1883. 21.--Legge, A. O., _Growth of the Temporal Power of the Papacy_. Lond., 1870. 22.--Littledale, R. F., _The Petrine Claims_. Lond., 1889. 23.--Mann, H. K., _Lives of the Popes in the Early Middle Ages_. Lond., 1906.