Athanasius visits Constantius
When therefore he wrote in this strain, and encouraged him by means of many (for he caused Polemius, Datianus, Bardion, Thalassus, Taurus, and Florentius, his Counts, in whom Athanasius could best confide, to write also): Athanasius committing the whole matter to God, who had stirred the conscience of Constantius to do this, came with his friends to him; and he gave him a favourable audience, and sent him away to go to his country and his Churches, writing at the same time to the magistrates in the several places, that whereas he had before commanded the ways to be guarded, they should now grant him a free passage. Then when the Bishop complained of the sufferings he had undergone, and of the letters which the Emperor had written against him, and besought him that the false accusations against him might not be revived by his enemies after his departure, saying, 'If you please, summon these persons; for as far as we are concerned they are at liberty to stand forth, and we will expose their conduct;' he would not do this, but commanded that whatever had been before slanderously written against him should all be destroyed and obliterated, affirming that he would never again listen to any such accusations, and that his purpose was fixed and unalterable. This he did not simply say, but sealed his words with oaths, calling upon God to be witness of them. And so encouraging him with many other words, and desiring him to be of good courage, he sends the following letters to the Bishops and Magistrates.
23. Constantius Augustus, the Great, the Conqueror, to the Bishops and Clergy of the Catholic Church.
The most Reverend Athanasius has not been deserted by the grace of God, etc.
Another Letter.
From Constantius to the people of Alexandria.
Desiring as we do your welfare in all respects, etc.
Another Letter.
Constantius Augustus, the Conqueror, to Nestorius, Prefect of Egypt.
It is well known that an order was heretofore given by us, and that certain documents are to be found prejudicial to the estimation of the most reverend Bishop Athanasius; and that these exist among the Orders of your worship. Now we desire your Sobriety, of which we have good proof, to transmit to our Court, in compliance with this our order, all the letters respecting the fore-mentioned person, which are found in your Order-book.
24. The following is the letter which he wrote after the death of the blessed Constans. It was written in Latin, and is here translated into Greek.
Constantius Augustus, the Conqueror, to Athanasius.
It is not unknown to your Prudence, that it was my constant prayer, that prosperity might attend my late brother Constans in all his undertakings; and your wisdom may therefore imagine how greatly I was afflicted when I learned that he had been taken off by most unhallowed hands. Now whereas there are certain persons who at the present truly mournful time are endeavouring to alarm you, I have therefore thought it right to address this letter to your Constancy, to exhort you that, as becomes a Bishop, you would teach the people those things which pertain to the divine religion, and that, as you are accustomed to do, you would employ your time in prayers together with them, and not give credit to vain rumours, whatever they may be. For our fixed determination is, that you should continue, agreeably to our desire, to perform the office of a Bishop in your own place. May Divine Providence preserve you, most beloved parent, many years.
Source: Historia Arianorum (New Advent)