250px|The division of Armenia after the Peace of Acilisene. The Peace of Acilisene was a treaty between the East Roman Empire  and the Sassanid Empire  sometime between 384 and 390 (usually dated to 387) which divided Greater Armenia between these two empires. Persia received the greater share. By this treaty the Byzantine Empire/East Roman Empire also finally admitted the loss of Kartli-Iberia to Sassanid Iran. From this point on, Iranian influence grew once again in eastern Georgia, and Zoroastrianism appeared to have become something like the second established religion alongside Christianity.
250px|The division of Armenia after the Peace of Acilisene. The Peace of Acilisene was a treaty between the East Roman Empire under Theodosius I and the Sassanid Empire under Shapur III sometime between 384 and 390 (usually dated to 387) . The treaty divided Greater Armenia between these two empires. Persia received the greater share. By this treaty the Byzantine Empire/East Roman Empire also finally admitted the loss of Kartli-Iberia to Sassanid Iran. From this point on, Iranian influence grew once again in eastern Georgia, and Zoroastrianism appeared to have become something like the second established religion alongside Christianity.
A
under Theodosius I
A
under Shapur III
R
which
. The treaty