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 1700th Anniversary of the First Council of Nicaea Vatican City, 2025 Today marks the anniversary of the first ecumenical council of the Catholic Church, the First Council of Nicaea. A pivotal event in early Christianity, historians have given the start date of the council as May 20, 325, although it may have started later in June. The council was held in what is now Iznik, Turkey, located in the northwest region of the country. In 2025, the 1700th anniversary of the Council of Nicaea was celebrated. Vatican City issued the souvenir sheet at the top of the article to commemorate the event, and Pope Leo XIV's first international trip took him to Turkey to honor the Council. An online article from NPR in the References reports on his visit to Iznik. Ecumenical councils, also called general or universal councils, are convened by church authorities to discuss and rule on issues related to Christian doctrine, Church administration, and other Church matters. To date, a total of twenty-one recognized ecumenical councils have been convoked. A list of these councils is given at the end of this article.  First Council of Nicaea Painting by Michael Damaskinos (1591) From Wikimedia Commons, in the Public Domain Following the issuance of the Edict of Milan in 313 AD, which granted Christians the freedom to practice Christianity without state interference, and the subsequent consolidation of power by Emperor Constantine the Great in 324 AD, he called for the convening of a church council. Attended by at least 200 bishops, the main accomplishment was the settlement of the Arian controversy and led to a firm definition of the consubstantial nature of Jesus Christ. In addition to defining the divine nature of Christ and his relationship to God the Father, the council also constructed the Nicene Creed, mandated a uniform observance of the date of Easter, and codified early canon law. 
 
 Stamps from Past Ecumenical Councils: Council of Calchedon (Scott 149, 1951) Council of Trent (Scott 110, 1946) First Vatican Council (Scott 486, 1970) Second Vatican Council (Scott 349, 1962) Turning to Vatican City philately, four ecumenical councils have been depicted on its stamps prior to 2025, with examples presented above. The souvenir sheet issued to commemorate the 1700th anniversary of the Council of Nicaea was released on May 27, 2025. The souvenir sheet depicts the fresco found in the Sistine Hall of the Vatican Apostolic Library. As described in the Vatican Post announcement for the souvenir sheet, it depicts "the First Council of Nicaea [and at] the center of the scene and the stamp is the Book of the Gospels, around which a host of bishops and papal legates, symbolically legitimized by the presence of the Apostle Peter and the Holy Trinity, condemn the theses of Arius in the presence of Emperor Constantine."Prior to his death, Pope Francis had indicated a desire to travel to Turkey for the anniversary of the Council, and Pope Leo XIV fulfilled this wish by traveling to the site in late November. LIST OF ECUMENICAL COUNCILS: 1. First Council of Nicaea (325) 2. The First Council of Constantinople (381) 3. The Council of Ephesus (431) 4. The Council of Chalcedon (451) 5. Second Council of Constantinople (553) 6. The Third Council of Constantinople (680–681) 7. The Second Council of Nicaea (787) 8. Fourth Council of Constantinople (Catholic) (869–870) 9. First Council of the Lateran (1123) 10. Second Council of the Lateran (1139) 11. Third Council of the Lateran (1179) 12. Fourth Council of the Lateran (1215) 13. First Council of Lyon (1245) 14. Second Council of Lyon (1274) 15. Council of Vienne (1311–1312) 16. Council of Constance (1414–1418) 17. Council of Basel, Ferrara and Florence (1431–1445) 18. Fifth Council of the Lateran (1512–1517) 19. Council of Trent (1545–1563, with interruptions) 20. First Council of the Vatican (1869–1870) 21. Second Council of the Vatican (1962–1965) Some additional ecumenical councils were convened but not recognized and are not included on this list. Click on the Wikipedia reference on Ecumenical Councils for an in-depth look at the councils and the issues discussed at each. REFERENCES: |
