Amida (Persian Wars).
This fortress, defended by a Roman garrison, was besieged, and after a vigorous defence taken by storm by the Persians under Sapor II in 359. The garrison and inhabitants were put to the sword. The siege, which lasted 73 days, cost the Persians 30,000 men, and so weakened Sapor that he was compelled to relinquish his designs upon the Eastern Empire.
The fortress was again besieged by the Persians under Kobad in 503, being defended as before by a Roman garrison. After a defence of three months, which cost the besiegers 50,000 men, a weakly defended tower was surprised at night, and on the following day the Persians, headed by their King, scaled the walls, and massacred 80,000 of the garrison and inhabitants.