Orientale. It represents a huge step forward for Easterners because, for the first time, they have a law of their own, allowing each of the sui juris Churches in the East to further develop its own particular law. (b) Another monumental contribution was the critical edition of the documents of the Council of Florence (1438-1445) by the professors of the Faculty of Eastern Ecclesial Sciences. This led to the decision of Pius XII in 1947 to purify the Armenian Catholic Rite of Latinization. Among other scholarly works of note are the finest study to date, in 6 volumes, of the Liturgy of St. John Chrysostom; the Encyclopedic Dictionary of the Christian East; annotated translations of 9th-13th-century Syrian manuscripts; a seven-volume edition of Vatican archival documents on the Armenian Question (1894-1925); a similar edition on the Chaldean-Assyrian question (1908-1938); annotated catalog of 150 Ethiopian manuscripts; detailed archaeological studies of mosaics, frescoes, and architecture of the early church in Asia Minor, and so on. Notable professors Guillaume Jerphanion, SJ, made a name for himself through his study of archaeology and the rock-hewn churches of Cappadocia. Marcel Viller, SJ, after teaching patristics at the Orientale, moved to become one of the founders of the monumental Dictionnaire de Spiritualité. According to his successor Cardinal Tomáš Špidlík, SJ, himself a noted exponent for Russian spiritual theology, Irenée Hausherr laid the foundations of Eastern spirituality, and his books sell as if they were written yesterday – as do the works of Juan Mateos, SJ, who, in the wake of Anton Baumstark (1872-1948), is considered by R.F. Taft, SJ and G. Winkler, to have founded at the Orientale "The Mateos School of Comparative Liturgiology". Georg Hofmann, SJ, was a German Church historian, who had a big part in the editing of the Florentine Acts. The Orientale has been blessed with a whole generation of outstanding liturgists, such as Miguel Arranz, SJ. Samir Khalil Samir, SJ has put the Arab-Christian Literature on the map. Gustav Wetter, SJ was a world authority on Marxism. Placid J. Podipara, C.M.I, was a world expert on the St Thomas Christians. Notable alumni Patriarch Bartholomew I of Constantinople, who studied here from 1963 to 1968 and wrote his thesis, On the Codification of the Sacred Canons and of the Canonical Precepts, under Prof. Ivan Žužek. Patriarch Gregorios III Laham, Catholic Patriarch emeritus of Antioch. Cardinal Josef Slipyj, first Major Archbishop of the Greek