The Synod
While a group of bishops were en route to Jerusalem to dedicate a new church (the precursor to the Holy Sepulchre), Constantine requested that they gather in the city of Tyre to consider the case against Athanasius. The Emperor also sent a letter to Athanasius, making clear that if he did not attend voluntarily, he would be brought to the Synod forcibly.
Eusebius of Caesarea presided over the assembly, and about 310 members attended. Athanasius appeared this time with forty-eight Egyptian bishops. The Synod condemned Athanasius, but he fled to Constantinople and confronted the Emperor personally.
Read more about this topic: First Synod Of Tyre