One figure with this name defeated the rebel Georg
One figure with this name defeated the rebel George Maniakes, and married his daughter to the son of Yaroslav the Wise. Another figure of this name convened the Sixth Ecumenical Council and condemned monothelitism as heresy before being defeated by the Bulgarian Khan Asparukh at the battle of Ongal. One man by this name ruled the Despotate of Morea before overcoming his brother Demetrios to obtain his most famous title, and that figure died anonymously shortly after the death of Giovanni Giustiniani. The most famous figure of this name executed his son Crispus after defeating Licinius. For 10 points, give this name whose most famous bearer crushed Maxentius at the Battle of Milvian Bridge before moving his capital to Byzantium, which he renamed after himself
One figure with this name defeated the rebel George Maniakes, and married his daughter to the son of Yaroslav the Wise.
Constantine [or Constantinus; or Constantine IX before "sixth ecumenical council" is read; do not accept "Constantius"]