Rome: Church leaders and Christian communities around the world are marking 1700 years since the First Council of Nicaea, a historic turning point that helped define the foundations of Christian faith and unity.

The anniversary is being seen not oxunly as a milestone in history but also as an invitation for renewed cooperation among churches today.

The original council took place in the year 325 in the ancient city of Nicaea, now known as Iznik in Turkey. More than 300 bishops attended, gathering under the rule of Emperor Constantine.

Their main task was to address disagreements about the identity of Jesus and to protect the unity of the early Church. The Council rejected the teachings of Arius, who claimed Jesus was created and not equal with God the Father. Instead, the bishops affirmed that Jesus is fully divine and of the same nature as the Father.

From this historic debate came one of Christianity’s most important statements of belief, now known as the Nicene Creed. The Creed continues to be prayed in churches every Sunday across denominations including Catholic, Orthodox, and many Protestant communities.

The anniversary comes at a time when the Christian world is deeply diverse and often divided. Catholic, Orthodox and Protestant leaders have expressed hope that remembering the Council may inspire greater unity. Many see it as a reminder that Christians once gathered to defend shared beliefs even while facing serious disagreements.

Church officials and ecumenical groups say the celebration is not only about looking back but about rediscovering what still connects Christians today.

Many statements released for the anniversary describe it as an opportunity to reflect, listen, and build friendships across church traditions.

Events marking the anniversary are taking place throughout 2025, including pilgrimages, conferences, and prayer services. Some Christian leaders have described the occasion as a rare chance to renew the message of cooperation, peace, and faith expressed nearly two millennia ago at Nicaea.

As the global Christian community reflects on the legacy of the Council, many hope its message will continue to shape the future. The memory of Nicaea serves as a reminder that unity remains a responsibility shared by all Christians, even in a time of change and disagreement.