of the archives of France and Belgium for the Gallia Christiana. Documents gathered from eight hundred abbeys and one hundred cathedrals. Veterum Scriptorum et Monumentorum Amplissima Collectio, 9 volumes, Rouen (1727–1733). Edited by French Benedictine historians Edmond Martène (1654–1739) and Ursin Durand (1682–1771). A continuation of Luc d'Achery's Spicilegium on ancient and medieval documents of interest to the Benedictines. Wetzer-Welte Kirchenlexikon, 12 volumes (1847–1860), an encyclopedic work of Catholic biography, history, and theology by German orientalist Heinrich Joseph Wetzer (1801–1853). Popes and the papacy Les Registres d'Alexandre IV, 3 volumes, Registres des Popes, Rome (1902, 1917). Edited by French historian Charles B. de La Roncière (1870–1941). Regesta of pope Alexander IV (1254–1261). (cf. French Wikipédia, Charles de La Roncière) Les Registres de Grégoire IX, 2 volumes, Registres des Popes, Rome (1896, 1907). Edited by French archivist Lucien Auvray (1860–1937). Regesta of pope Gregory IX (1227–1241). Les Registres de Grégoire X, 2 volumes, Registres des Popes, Rome (1892, 1906). Edited by French historian Jean Guiraud (1866–1953). Regesta of pope Gregory X (1271–1276). Les Registres d'Honorius IV, 1 volume, Registres des Popes, Rome (1886–1888). Edited by French historian and numismatist Maurice Prou (1861–1930). Regesta of pope Honorius IV (1285–1287). Les Registres d'Innocent IV, 4 volumes, Registres des Popes, Rome (1884–1921). Edited by French palaeographer and archivist Élie Berger (1850–1921). Regesta of pope Innocent IV (1243–1254). Les Registres de Nicolas III, 2 volumes, Registres des Popes, Rome (1898, 1938). Edited by French historians Jules Gay (1867–1935) and Suzanne Vitte. Regesta of pope Nicholas III (1227–1280). (cf. French Wikipédia, Jules Gay) Les Registres de Nicolas IV, 9 parts in 2 volumes, Registres des Popes, Rome (1896, 1905). Edited by French medieval historian Ernest Langlois (1857–1924). Regesta of pope Nicholas IV (1228–1292). Liber Pontificalis, 2 volumes, Paris (1884–1892). Edited by French historian Louis Duchesne (1843–1922), based on a first edition by Dutch theologian Joannes Busaeus (1547–1611). The Book of Popes is a collection of biographies of the popes through 1464, from Saint Peter through Pius II. Miscellanea Historiae Pontificiae (MHP), series, Rome (1939–present). Studies of pontifical history published by Pontificia University Gregoriana. Ponticicia commissio ad redigendum codicem luris canonici orientalis (PC), 117 works in 155 volumes, Fontes-Vatican (1935 ff.). Established by Pius XI in 1935 to draw up a code of Oriental canon law. Pontificum Romanorum, qui fuerunt inde ab exeunte saeculo IX usque ad finum saeculi XIII, vitae ab aequalibus conscriptae, 2 volumes, Leipzig