Although the early church convened local and regional church councils in an attempt to debate and formulate its theological positions, these gatherings carried no authority over the whole Christian world. However, beginning in 325, Roman emperors gathered early church leaders in seven ecumenical councils, held over 462 years, between 325 and 787.
Each of these Ecumenical Church Councils took place in the Greek-speaking East and was primarily focused on the theological issues related to the triune nature of God (the Trinity) and Jesus Christ (Christology). Most of the early church fathers lived in the East and so most early theological writings were in Greek. Even in Rome, Christians worshiped in Greek until around 380. The Roman Catholic Pope (bishop) did not attend any of the councils.
Source: Dr. Andrew Jackson - "The Ecumenical Church Councils of the Early Church (325-787)"
https://www.drandrewjackson.com/the-ecumenical-church-of-councils-of-the-early-church-325-787/
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