Q
Quaestor
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Constantine did not preside at the council. The Arian heresy affected only the Eastern Churches. What the pope did was to appoint Hosius who was bishop of Cordoba in the province of Hispania as the presiding bishop and appointed two legates to the council. Sylvester suspected Constantine of heresy and chose Hosius as he was less likely to be swayed by the emperor. It is also speculated that Hosius, one his way to the council, went by Rome to receive his instructions from Sylvester.