 With Constans' death in 668, the throne passed to his son Constantine IV.Pope Vitalian, who had hosted the visit of Constans II to Rome in 663, almost immediately declared himself in favour of the doctrine of the two wills of Christ, the orthodox Chalcedonian position.In response, Patriarch Theodore I of Constantinople and Macarius, Patriarch of Antioch, both pressed Constantine to take measures against the Pope.