Opens the Council of Nicaea
· Imperial Palace, Nicaea (İznik, Turkey)
Constantine attended the First Council of Nicaea, formally entered the assembly, delivered an opening speech, and joined its debates. The itinerary attests him at Nicaea by May 23; the council's formal opening is variously dated to May 20 or later in June. Coordinates represent İznik because the palace site is not securely identified.
