Theodore, the most holy bishop of the city of Dara in Libya, told us this:
When I was syncellos to the saintly Pope Eulogios [of Alexandria], in my sleep I saw a tall, impressive looking man who said to me: ‘Announce me to Pope Eulogios.’ I asked him: ‘Who are you, my lord? How do you wished to be announced?’ He replied: ‘I am Leo, Pope of Rome’, so I went in and announced: ‘The most holy and blessed Leo, Primate of the Church of the Romans, wishes to pay you his respects. As soon as Pope Eulogios heard, he got up and came running to meet him. They embraced each other, offered a prayer and sat down. Then the truly godly and divinely-inspired Leo said to Pope Eulogios: ‘Do you know why I have come to you?’ The other said he did not: ‘I have come to thank you’, he said, ‘because you have defended so well, and so intelligently, the letter which I wrote to our brother, Flavian, Patriarch of Constantinople. You have declared my meaning and sealed up the mouths of the heretics. And know, brother, that it is not only me whom you have gratified by this labor of yours, but also Peter, the Chief of the Apostles; and, above all, the very Truth which is proclaimed by us, which is Christ our God.’ I saw this, not only once, but three times. Convinced by the third apparition, I told it to the saintly Pope Eulogios. He wept when he heard it and, stretching out his hands to heaven, he gave thanks to God, saying: ‘I give you thanks, Lord Christ, our God, that you have made my unworthiness become a proclaimer of the truth, and that, by the prayers of your servants Peter and Leo, your Goodness has received our feeble endeavor as you did receive the widow’s two mites.’ (The Spiritual Meadow, 148)