15.--Stumpf, K. F., _Die Kaiserurkunden des X., XI., und XII., Jahrhunderts Chronologisch verzeichnet_. Innsb., 1865-83. 16.--Waitz, G., _Urkunden zur Deutschen Verfassungsgeschichte im 11 und 12 Jahrhundert_. Keil, 1886. B.--SECONDARY: I.--SPECIAL: 1.--Bryce, J., _The Holy Roman Empire_. Rev. ed., 1904. 2.--Döllinger, J. J. I., _The Empire of Charles the Great and His Successors_. Lond., 1894. 3.--Dunning, W. A., _History of Political Theories_. N. Y., 1901. Vol. i. 4.--Emerton, E., _Mediæval Europe_. Bost., 1896. 5.--Fisher, H. A. L., _The Mediæval Empire_. Lond., 1898. 2 vols. 6.--Gierke, O., _Political Theories of the Middle Ages_. Camb., 1900. 7.--Greenwood, A. D., _Empire and Papacy in the Middle Ages_. Lond., 1896. 8.--Greenwood, T., _Cathedra Petri_. Lond., 1859-72. 6 vols. 9.--Gregorovius, F., _History of the City of Rome in the Middle Ages_. Lond., 1903. Vol. iii. 10.--Lea, H. C., _Studies in Church History_. 11.--Maitland, S. R., _The Dark Ages_. 2d ed. Lond., 1845. 12.--Oman, C., _The Dark Ages_. Lond., 1898. 13.--Tout, T. F., _The Empire and the Papacy_. Lond., 1898. 14.--Turner, S. E., _Sketch of the Germanic Constitution_. N. Y., 1888. 26-80. Bibliographical Note:--Some of the best books on this subject are in German. So far no translations have appeared. Among many may be mentioned:--Dresdner, _Kultur- und Sittengeschichte der italienischen Geistlichkeit_ 1890. 2.--Giesebrecht, W. V., _Geschichte der deutschen Kaiserzeit_. Braun., 1895. i.-ii. 6 vols. 3.--Hauck, A., _Kirchengeschichte Deutschlands_. Leip., 1887-1900. Vol. iii. 4.--_Jahrbücher der Deutschen Geschichte._ Berlin, 1862 ff. 5.--Langen, _Geschichte der römischen Kirche_. Vol. iii. 6.--Richter, G., and Kohl, H., _Annalen der Deutschen Geschichte im Mittelalter_. Halle, 1873-90. 7.--Waitz, G., _Deutsche Verfassungsgeschichte_. Kiel, 1844 _ff._ 8 vols. 8.--Watterich, _Pontificum romanorum vitæ ab aequalibus conscriptae_. 1862. 2 vols. II.--GENERAL: Adams, ch. 7, 8, 10. Alzog, ii., 107-111. Butler, ch. 31, 55-57, 62. Chantrel, ch. 3. Coxe, Lect. 4, sec. 20-25. Crooks, ch. 33. Darras, ii., 358, 580. Döllinger, iii., ch. 4, sec. 1; ch. 5, sec. 2-3. Fisher, pd. 5, ch. 2; pd. 6, ch. 2. Gibbon, ch. 49. Gieseler § 21, 22, 24, 27. Gilmartin, i., 31. Hallam, ch. 1, pt. 1; ch. 3, pt. 1. Hardwick, ch. 4, sec. 2; ch. 10, sec. 2. Hase, sec. 170-192. Hore, ch. 12. Kurtz, i., 436-438, 483-495, ii., 25-52. Milman, bk. 5, ch. 7, 11, 12, 13. Moeller, pd. 2, ch. 2. Mosheim, cent. 9, 10. Neander, pd. 4, § 2. Schaff, pd. 4, ch. 4. FOOTNOTES: