5 For Cyril, however, it was not enough to fight vigorously against heresies as they arose, not enough to guard the integrity of Catholic doctrine with energy and solicitude and throw the fullest possible light upon it; he was also untiring in his labors to recall his erring brethren to the straight path of the truth. For when the Bishops of the Province of Antioch were still refusing to recognize the authority of the holy Council of Ephesus, it was due to his efforts that they were at length, after long vicissitudes, brought to complete agreement. And it was only after he had succeeded with God's help in accomplishing this happy reunion and in guarding and securing it against misconceptions that, being now ripe for the reward of everlasting glory, he was taken up to heaven in the year 444, mourned by all men of good will.
Source: Orientalis Ecclesiae (Vatican.va)