The pope’s planned Nov. 28 visit ties together two strands of Christian history: a creed that shaped worship for centuries and a moment when imperial power helped steer church doctrine. According to the reporting, the Council of Nicaea, held in 325 in what is now Turkey, became a defining reference for later Christians because it addressed core claims about Jesus and the shared calendar for major observances like Easter.

Giovanni Maria Vian, a church historian and coauthor of La scommessa di Costantino (Constantine’s Gamble), called the council a pivotal moment, describing it as “very, very important — the first global, ecumenical council in history and the first form of creed acknowledged by all the Christians.” Vian’s assessment was tied to the fact that the council gathered bishops from across the Roman Empire and produced a statement many churches continue to treat as central.

The commemoration will take place through a joint observance with Patriarch Bartholomew, described in the reporting as the spiritual leader of Eastern Orthodox Christians. The trip, described as part of Pope Leo XIV’s first major foreign travel as pope, centers on the Nicaea site to mark 1,700 years since the council that produced the earliest form of the Nicene Creed.

The council’s significance also reflects the political conditions surrounding it. The reporting describes Emperor Constantine as having consolidated control over the empire after years of civil war, and it says Constantine had not formally converted to Christianity until the end of his life, while still showing tolerance and favor toward a Christian sect by 325. In that setting, the Council of Nicaea is presented as both a church milestone and an early instance of church-state collaboration.

Within the council debates, the reporting says the controversy centered not on whether there is a Trinity—Father, Son, and Holy Spirit—but on how the Son relates to the Father. It describes Arius, an Egyptian priest, as giving his name to the doctrine of Arianism, which depicted Jesus as the highest created being but not equal to God, while an opposing view—championed by an Egyptian bishop—held that Jesus was eternally equal to the Father.

The reporting says the bishops supported a creed endorsed by the emperor, including a declaration that Jesus is “true God” and a condemnation of those who proclaimed Arian ideas. It also describes the creed’s language about Jesus being equal to the Father “of one substance” — the Greek term “homoousios,” presented as coming from Greek philosophy rather than the Bible — as part of what later Christians have recited in worship.

Along with the creed, the council adopted a formula for determining Easter. The reporting says it set Easter for the Sunday after the first full moon of spring and that this calendar choice drew support associated with Arian sympathizers, a point highlighted by historian David Potter. Potter, who wrote Constantine the Emperor and is a University of Michigan professor of Greek and Roman history, described the council as “an extraordinary diplomatic success for Constantine, because he got the two sides to agree,” and added that “I’ve often thought that it’s nice that a piece of imperial legislation is read out every Sunday.”

Even as the creed and the Easter formula were meant to bring unity, the reporting says the settlement did not end all conflict. It says Arius later returned to political favor and that doctrinal debate raged for generations, including after the capital shifted to Constantinople. As an example of continuing dispute, the reporting quotes St. Gregory of Nyssa describing people in the streets arguing over theological points well beyond church walls.

The reporting also points to another aspect of Nicaea’s legacy: when the council set the Easter observance, it distanced it from Jewish Passover and used “highly contemptuous language for Jews.” Potter is quoted saying, “Institutional antisemitism was absolutely a feature of the church,” and the reporting says that harsh language helped set a precedent for centuries of persecution of Jewish minorities in Christian lands.

Finally, the reporting frames Nicaea as both a marker of Christian agreement and a reminder of later division. It says Catholic, Orthodox and most historic Protestant groups accept the creed, while noting subsequent schisms over other issues, including controversies that unfolded later over how the Holy Spirit’s role is described and over different approaches to celebrating Easter.

VERIFIED FIGURES

  • series_id: MSPUS name: Median Sales Price of Houses Sold value: 410800.0 transformation: raw as_of: 2025-11-20 source: fred caption: Caption not used in this article.