In the summer of 325 , the bishops of all provinces came to Nicaea ( now known as Ä znik , in modern-day Turkey ) , a place easily accessible to the majority of them , particularly those of Asia Minor , Syria , Palestine , Egypt , Greece , and Thrace . In the summer of 325 , the bishops of all provinces were summoned to Nicaea ( now known as Ä znik , in modern-day Turkey ) , a place easily accessible to the majority of delegates , particularly those of Asia Minor , Syria , Palestine , Egypt , Greece , and Thrace .