The Second Council of Lyons (A.D. 1274) was convoked by Pope Gregory X for the sake of union with the Greeks, the crusade, and reform of the Church. Representatives of Emperor Michael VIII Palaeologus and the Greek Orthodox Church participated. In the fourth session, union between the Greek and Latin Churches was agreed upon and defined. The union, however, soon dissolved. Image above links to Tanner translation of the decrees. ISBN recommendation: 0-87840-490-2