"Ο Γρηγόριος Ι΄ συγκάλεσε την γενική σύνοδο στις 31 Μαρτίου 1272 . . outlined three themes: union with the Greeks, the crusade, and the reform of the church. Regarding the third theme, which was not only traditional in medieval councils but was also required by the actual state of ecclesiastical morals, the pope in March 1273 sought the opinion of all christian people and asked for their help. After long preparatory arrangements the council assembled at Lyons and opened on 7 May 1274 . . . Οι Έλληνες έφθασαν αργά, στις 24 Ιουνίου, αφότου είχαν ναυαγήσει . . . The council had six general sessions: on 7 and 18 May, 4 (or 7) June, and in July on the 6th, the 16th and 17th. (from Papal Encyclicals.net, accessed 23 January 2012
