The Third Lateran Council (A.D. 1179), was convoked by Pope Alexander III after the Battle of Legnano and the surrender of Emperor Frederick I. The primary object of the council was to end the nearly 20 year schism supported by the Emperor against Alexander. Image above links to Tanner translation of the Council decrees. ISBN recommendation: 0-87840-490-2
The Second Lateran Council (A.D. 1139) was convoked by Pope Innocent II after the death of the antipope, Anacletus II (Peter Leoni). The Council sought to consolidate unity and reestablish ecclesial discipline. Image above links to Tanner translation of the Council decrees. ISBN recommendation: 0-87840-490-2
The First Lateran Council (A.D. 1123), convoked by Pope Callistus II immediately after the Concordat of Worms, marks the beginning of the movement towards separation of Church and State. Image above links to Tanner translation of the Council decrees. ISBN recommendation: 0-87840-490-2
Decrees of the Seventh Ecumenical Council (A.D. 787) which was summoned to address the issue of iconoclasm. The council declared the production and exposure of art representing Christ and the saints to be an authentic ecclesiastical tradition in harmony with the spread of the gospel. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2. For a more detailed defense of holy art, see St. John of Damascus: Apologies Against Those Who Attack the Divine Images in Appendix I.
Decrees of the Sixth Ecumenical Council (A.D. 680-681) which proclaimed and confirmed, against the teaching of the Monothelites, two natural volitions and two natural principles of action in Christ, His human will following and subject to His Divine Will. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2
Decrees of the Fifth Ecumenical Council (A.D. 553), summoned by the Emperor Flavius Justinian, which condemned (as Nestorian and heretical) teachings expounded by Theodore, bishop of Mopsuestia; Theodoret; and the so called letter of Ibas to Mari the Persian. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2
Decrees of the Fourth Ecumenical Council (A.D. 451) which affirmed along with Pope St. Leo I that Jesus Christ was both fully human and fully divine: having two natures and two wills perfectly united in his one person. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2
Decrees of the Third Ecumenical Council (A.D. 431) which explained and confirmed, against the teaching of Nestorius of Constantinople, that the Marian title Theotokos (Mother of GOD) is not in contradiction to the Catholic Faith. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2
Decrees of the Second Ecumenical Council (A.D. 381) which confirmed the Nicene profession of faith and the equal Divinity of the Father, the Son, and the Holy Spirit. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2
Decrees of the First Ecumenical Council (A.D. 325) in which teachings of Arius of Alexandria are placed under anathema and the consubstantiality of Jesus Christ with GOD the Father is confirmed. Image above links to Tanner translation. ISBN recommendation: 0-87840-490-2