The Romans seem to have gained certain advantages in Northern Armenia and Iberia, while Chosroes on his part carried the war once more into Armenia Minor, and laid siege to Theodosiopolis, which, however, he was unable to take.

Negotiations were upon this resumed, and had progressed favorably to a certain, point, when news arrived of a great disaster to the Roman arms in Armenia, which changed the face of affairs and caused the Persian negotiators to break up the conference.

Tam-chosro, a Persian general, had completely defeated the Roman army under Justinian.

Armenia had returned to its allegiance.

There seemed every reason to believe that more was to be gained by arms than by diplomacy, and that, when the three years peace had run out, the Great King might renew the general war with a prospect of obtaining important successes.
There are no military events which can be referred to the year A.D.
577.