He even ventured to form the siege of that city; but it was not long before effectual relief arrived; from all the provinces flocked in contingents for the defence of the Western capital; several engagements were fought, in some of which Odenathus was defeated; and at last he found himself involved in difficulties through his ignorance of the localities, and so thought it best to retire.

Apparently his retreat was undisturbed; he succeeded in carrying off his booty and his prisoners, among whom were several satraps, and he retained possession of Mesopotamia, which continued to form a part of the Palmyrene kingdom until the capture of Zenobia by Aurelian (A.D.

273).
The successes of Odenathus in A.D.263 were followed by a period of comparative tranquillity.

That ambitious prince seems to have been content with ruling from the Tigris to the Mediterranean, and with the titles of "Augustus," which he received from the Roman emperor, Gallienus, and "king of kings," which he assumed upon his coins.

He did not press further upon Sapor; nor did the Roman emperor make any serious attempt to recover his father's person or revenge his defeat upon the Persians.