4 surviving letters between Cyriacus and Pope Gregory the Great, spanning 596-603 AD.
Gregory to Cyriacus, Bishop of Constantinople. We have received with becoming charity our common sons, George the presbyter and Theodore your deacon; and we rejoice that you have passed from the care of ecclesiastical business to the government of souls, since, according to the voice of the Truth, He that is faithful in a little will be faithful...
Gregory to Cyriacus, Bishop of Constantinople. When in time past I represented the Apostolic See in the royal city, I became acquainted with the good qualities of your Holiness. And I greatly rejoice that the care of souls has been committed to you.
Gregory to Cyriacus, Bishop of Constantinople. We have received the letters of your Blessedness, which speak to us in words not of the tongue but of the soul. For they open to me your mind, which, however, was not closed to me, since of myself I retain experience of the same sweetness.
Observing diligently, most dear brother, how great is the virtue of peace from the Lord's voice, which says, My peace I give unto you John 14:27, it becomes us so to abide in the love thereof as in no wise to give place to discord. But, since we cannot otherwise live in its root except by retaining in mind and in deed the humility which the very...