The siege of Amida occurred in 502–503, during the Anastasian War. The city was not garrisoned by any troops of the Byzantine Empire but nevertheless resisted for three months before falling to the military of the Sasanian Empire under Kavadh I. According to the detailed account of Zacharias Rhetor, the city's sack was particularly brutal, and accompanied by a massacre of the population for three days and nights. The fall of the city urged the Emperor Anastasius I Dicorus to react militarily, before a truce was agreed between both parts in 505.