Answer
Ctesiphon, the capital of the Sasanian Empire, withstood a siege led by Odaenathus, the ruler of the Palmyrene Empire. Odaenathus's forces were unable to capture the city, despite repeated attempts. This marked a significant victory for the Sasanians and helped to maintain their control over Mesopotamia. The failure of Odaenathus to take Ctesiphon also contributed to the weakening of his empire, which would eventually be conquered by the Romans.