superisis said:I'm not talking about Byzantines war against the Seljuk Turks, thus not about the battle of Manzikert.
I'm talking about the war between The Roman Empire (or the Byzantine Empire, whatever you prefer) and the Sassanian Persian Empire. It was a huge war, but was overshadowed by the Arab conquests a few decades later (where the Arabs conquered the most prosperous areas of the Byzantine empire, not all of the Byzantine empire).
P.S. If you're confused the richest part of the Roman empire has always been Syria and Egypt.
I agree somewhat with your opinion; the war is very well known to people who study the period, and, in fact, is considered to be the actual turning point when the Eastern Roman empire ends, and the Byzantine empire begins.
that said, over the cours eof roman history, various provinces outshone egypt (wasnt hard otoutshine the levant actually; most of the regions major land trade routes went though "neutral" city states on the very cusp of the arabian desert (AKA; Palmyra), and more land trade went directlly to Anatolia, and thus Byzantium/Constantinople by land, and by red sea, to the ports of egypt, to be transferred to Alexandria.