With the reign of Heraclius, he and the Patriarch Sergius had attempted to find common ground between the Chalcedonians and the Non-Chalcedonians by issuing the doctrine of the single energy of Christ during the mid 630s. It did gain some acceptance initially, with Pope Honorius I giving his written assent, though it is clear that he considered the problem one of terminology, not theology. However, this compromise position was firmly opposed by the Patriarch of Jerusalem, Sophronius, and the doctrine was repudiated at the synod of Cyprus.