sentences:  He moved down the Tigris, taking Ctesiphon, and gazing onwards to the ruins of Babylon before returning to Roman territory via the Euphrates.No source ever specifically claims that Ctesiphon was sacked, but it is assumed to have been, primarily due to the seizure of Narseh's wife and harem.Narseh had previously sent an ambassador to Galerius to plead for the return of his wife and children, but Galerius had dismissed this ambassador, reminding him of how Shapur had treated Valerian.