DECREES OF THE ECUMENICAL COUNCILS

First Council of Lyons (1245)

First Council of Lyons (1245). Innocent IV presided the Patriarchs of Constantinople, Antioch, and Aquileia (Venice), 140 bishops, Baldwin II, Emperor of the East, and St. Louis, King of France, assisted. It excommunicated and deposed Emperor Frederick II and directed a new crusade, under the command of St. Louis, against the Saracens and Mongols.

Council of Lyons (1274)

Council of Lyons (1274) with Pope Gregory X, the Patriarchs of Antioch and Constantinople, 15 cardinals, 500 bishops, and more than 1000 other dignitaries. It effected a temporary reunion of the Greek Church with Rome. The word filioque was added to the symbol of Constantinople and means were sought for recovering Palestine from the Turks. It also laid down the rules for papal elections.

Council of Vienne in France (1311-1313)

Council of Vienne in France (1311-1313) by order of Clement V, the first of the Avignon popes. The Patriarchs of Antioch and Alexandria, 300 bishops (114 according to some authorities), and 3 kings -- Philip IV of France, Edward II of England, and James II of Aragon -- were present. The synod dealt with the crimes and errors imputed to the Knights Templars, the Fraticelli, the Beghards, and the Beguines, with projects of a new crusade, the reformation of the clergy, and the teaching of Oriental languages in the universities.

Council of Constance (1414-1418)

Council of Constance (1414-1418), was held during the great Schism of the West, with the object of ending the divisions in the Church. It only became legitimate when Gregory XII formally convoked it. Owing to this circumstance it succeeded in putting an end to the schism by the election of Pope Martin V, which the Council of Pisa (1403) had failed to accomplish on account of its illegality. The rightful pope confirmed the former decrees of the synod against Wyclif and Hus. This council is thus only ecumenical in its last sessions (XLII-XLV inclusive) and with respect to the decrees of earlier sessions approved by Martin V. This excludes Haec Sancta, the decree teaching conciliarism.