Derde van een serie van 5 Oecumenische Concilies gehouden in het Lateranen [d:290] van 5-19 of 22 maart 1179. Hierbij een samenvatting van de belangrijkste Canons, door dit Concilie afgekondigd. (Aan een vertaling wordt gewerkt)

Canons van het Derde Lateraans Concilie:

• Canon 1 [4478|1]: To prevent schisms in future, only the cardinals should have the right to elect the pope, and two-thirds of their votes should be required for the validity of such election. If any candidate, after securing only one-third of the votes, should arrogate to himself the papal dignity, both he and his partisans should be excluded from the ecclesiastical order and excommunicated.
• Canon 2: Annulment of the ordinations performed by the heresiarchs Octavian and Guy of Crema, as well as those by John de Struma. Those who have received ecclesiastical dignities or benefices from these persons are deprived of the same; those who have freely sworn to adhere to the schism are declared suspended.
• Canon 3: It is forbidden to promote anyone to the episcopate before the age of thirty. Deaneries, archdeaconries, parochial charges, and other benefices involving the care of souls shall not be conferred upon anyone less than twenty-five years of age.
• Canon 4 regulates the retinue of members of the higher clergy, whose canonical visits were frequently ruinous to the rural priests. Thenceforward the train of an archbishop is not to include more than forty or fifty horses; that of a bishop, not more than twenty or thirty; that of an archdeacon, five or seven at the most -- the dean is to have two.
• Canon 5 forbids the ordination of clerics not provided with an ecclesiastical title, i. e. means of proper support. If a bishop ordains a priest or a deacon without assigning him a certain title on which he can subsist, the bishop shall provide such cleric with means of liveli hood until he can assure him an ecclesiastical revenue that is, if the cleric cannot subsist on his patrimony alone.
• Canon 6 regulates the formalities of ecclesiastical sentences.
• Canon 7 forbids the exaction of a sum of money for the burial of the dead, the marriage benediction, and, in general, for the administration of the sacraments.
• Canon 8: The patrons of benefices shall nominate to such benefices within six months after the occurrence of a vacancy.
• Canon 9 recalls the military orders of the Templars and the Hospitallers to the observation of canonical regulations, from which the churches dependent on them are in no wise exempt.
• Canon 10 [4478|10]: Monniken mogen niet voor geld opgenomen worden in een klooster.
• Canon 11 forbids clerics to receive women in their houses, or to frequent, without necessity, the monasteries of nuns.
• Canon 14 forbids laymen to transfer to other laymen the tithes which they possess, under pain of being debarred from the communion of the faithful and deprived of Christian burial.
• Canon 18 provides for the establishment in every cathedral church of a school for poor clerics.
• Canon 19: Excommunication aimed at those who levy contributions on churches and churchmen without the consent of the bishop and clergy.
• Canon 20 forbids tournaments.
• Canon 21 relates to the "Truce of God".
• Canon 23 relates to the organization of asylums for lepers.
• Canon 24 consists of a prohibition against furnishing the Saracens with material for the construction of their galleys.
• Canon 27 [4478|27] enjoins on princes the repression of heresy.