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Archaeologists unearth secret church tied to Council of Nicaea, Christianity's defining moment
By Andrea Margolis
Published August 10, 2026
Archaeologists in Turkey believe they've made a groundbreaking discovery, possibly uncovering the remains of a church they believe hosted the First Council of Nicaea, one of the most pivotal events in the history of Christianity.
An international team of researchers continued excavations in July at a church complex in the ancient city of Nicaea, now within the modern town of İznik, according to Turkish state media outlet Anadolu Agency (AA).
The structure, which excavation director Mustafa Şahin identified as the Church of St. Neophytos, was destroyed by an earthquake in 368 A.D., according to AA.
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It was soon replaced by the Church of the Holy Fathers, built around 380 A.D.
The latest findings from the excavations align with accounts found in ancient written sources, Şahin told Fox News Digital.
Archaeologists said they uncovered evidence of an earlier church they believed hosted the First Council of Nicaea in A.D. 325. (Mustafa Yılmaz/Anadolu via Getty Images; Fine Art Images/Heritage Images/Getty Images)
He said researchers discovered that floor pavement outside the later church continued into the prothesis chamber, an area beside the sanctuary, and ran beneath its eastern wall, suggesting it belonged to an earlier phase of the church complex.
"This first phase may correspond to the small church recounted in the written sources [about the Council of Nicaea]," he said.
Pictures show archaeologists excavating the stone foundations of the ancient church complex along the shore of Lake İznik, where trenches have exposed centuries-old walls and masonry.
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Speaking to AA, Şahin described how researchers pursued the clue during this season's excavation.
"That was our most important question this season," he said. "We began excavating east of the prothesis, outside the church's exterior wall."
He added, "At the end of the first week, as we had hoped, we discovered that the floor paving continued beyond the existing church."
The excavation took place in the ancient city of Nicaea, now the modern Turkish town of İznik. (Mustafa Yilmaz/Anadolu via Getty Images)
Nicaea is famous for hosting the First Council of Nicaea in 325 A.D. — the first-ever ecumenical council in Christian history.
The council famously produced the Nicene Creed, affirming that Jesus was "begotten, not made" and fully divine rather than a created being.
It represented one of the earliest efforts to unify Christian doctrine across the Roman Empire, and rejected the beliefs of Arius, who argued that Christ was a created being rather than co-eternal with God the Father.
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Archaeologists first identified a large submerged basilica at the site in 2014, later determining it was the Church of the Holy Fathers.
"We are very pleased because our hypothesis has been confirmed."
While that basilica has long been associated with the First Council of Nicaea, Şahin told AA the newly uncovered, smaller church beneath it is a more likely candidate.
Şahin said coins recovered from graves beneath the later basilica helped date its construction to around A.D. 380, reinforcing his conclusion that an earlier church occupied the site at the time of the council.
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Eusebius of Caesarea, who attended the First Council of Nicaea, described the meeting as taking place in a small church — a detail that Şahin said supports his hypothesis.
"The church was so small that one wonders how so many bishops fit inside," said Şahin, per AA. "This itself was a great miracle of God."
Historical accounts by Eusebius of Caesarea played a role in researchers' interpretation of the site, according to Şahin. (Mustafa Yilmaz/Anadolu via Getty Images)
After uncovering evidence that the basilica had been built over an earlier church, Şahin said he was confident the Church of St. Neophytos stood beneath the Church of the Holy Fathers and was the church that hosted the First Council of Nicaea.
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"The Church of the Holy Fathers... was built after 380 over the site of the First Council and in memory of the bishops who attended it," he told AA. "As of this year, we are in a position to say definitively that the Church of the Holy Fathers is located here. We are very pleased because our hypothesis has been confirmed."
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Turkey has been the site of numerous archaeological discoveries tied to early Christianity.
Researchers said the findings reinforced their conclusion that the Church of the Holy Fathers was built over the site of the First Council of Nicaea. (Fine Art Images/Heritage Images via Getty Images; Mustafa Yilmaz/Anadolu via Getty Images)
Last summer, archaeologists excavating the ancient city of Olympos in southern Turkey uncovered a fifth-century Christian church featuring a long-hidden inscription.
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Later that year, archaeologists in southwestern Turkey uncovered the remains of a Roman hospital that was later converted into a Christian sanctuary.
https://www.foxnews.com/travel/archaeologists-unearth-secret-church-tied-council-nicaea-christianitys-defining-moment