Editing Diocletian (section)

====Peace negotiations====
Narseh sent an ambassador to Galerius to plead for the return of his wives and children in the course of the war, but Galerius dismissed him.{{sfn|Barnes|1981|p=18}} Serious peace negotiations began in the spring of 299. The ''magister memoriae'' (secretary) of Diocletian and Galerius, Sicorius Probus, was sent to Narseh to present terms.{{sfn|Barnes|1981|p=18}} The conditions of the resulting [[Peace of Nisibis (299)|Peace of Nisibis]] were heavy:{{sfn|Potter|2005|p=293}}  Armenia returned to Roman domination, with the fort of Ziatha as its border; [[Kingdom of Iberia (antiquity)|Caucasian Iberia]] would pay allegiance to Rome under a Roman appointee; Nisibis, now under Roman rule, would become the sole conduit for trade between Persia and Rome; and Rome would exercise control over the five satrapies between the Tigris and Armenia: [[Angeghtun|Ingilene]], Sophanene ([[Sophene]]), Arzanene ([[Aghdznik]]), [[Corduene]] (Carduene), and Zabdicene (near modern [[Hakkâri (city)|Hakkâri]], Turkey). These regions included the passage of the Tigris through the [[Anti-Taurus Mountains|Anti-Taurus]] range; the [[Bitlis]] pass, the quickest southerly route into Persian Armenia; and access to the [[Tur Abdin]] plateau.{{sfnm|1a1=Millar|1y=1993|1pp=178–179|2a1=Potter|2y=2005|2p=293}}

A stretch of land containing the later strategic strongholds of Amida ([[Diyarbakır]], Turkey) and [[Bezabde]] came under firm Roman military occupation.{{sfn|Millar|1993|p=178}} With these territories, Rome would have an advance station north of Ctesiphon, and would be able to slow any future advance of Persian forces through the region.{{sfn|Potter|2005|p=293}}  Many cities east of the Tigris came under Roman control, including [[Tigranocerta|Tigranokert]], [[Siirt|Saird]], [[Silvan, Diyarbakır|Martyropolis]], [[Bitlis|Balalesa]], [[Bakhchisaray|Moxos]], [[Duhok, Iraq|Daudia]], and Arzan&nbsp;– though under what status is unclear.{{sfn|Millar|1993|p=178}} At the conclusion of the peace, Tiridates regained both his throne and the entirety of his ancestral claim.{{sfn|Barnes|1981|p=18}} Rome secured a wide zone of cultural influence, which led to a wide diffusion of [[Syriac Christianity]] from a center at Nisibis in later decades, and the eventual Christianization of Armenia.{{sfn|Potter|2005|p=293}} 

To strengthen the defence of the east Diocletian had a fortified road constructed at the southern border, where the empire bordered the Arabs, in the year 300. This road would remain in use for centuries but proved ineffective in defending the border as conventional armies could not operate in the region.<ref name="RR">{{Cite book|title=Rome Resurgent: War and Empire in the Age of Justinian|last=Heather, P. J. (Peter J.)|isbn=978-0-19-936274-5|location=New York |publisher=Oxford University Press |oclc=1007044617|year = 2018}}</ref>