Per wiki, Orientalism was <i>institutionalized </i>with Diocletian (284 to 305 AD) of the Tetrarchy. Constantine ascended in 307 AD and he retired to the Eastern portion with the purported full regalia of a sultan.
Of course, the seeds of Orientalism had been sown long before.
<!--QuoteBegin-->QUOTE<!--QuoteEBegin-->http://en.wikipedia.org/wiki/Orientalism
The precise, original distinction between the "West" and the "East" is difficult to ascertain. Because of the Graeco-Persian, Athenian historians drew a sharp, distinguishing line between their civic culture and Persian despotism, but <b>the institutional distinction, between East and West, did not exist as a defined polarity before the Oriens- and Occidens-divided administration of the Emperor Diocletian's Roman Empire, </b>however<!--QuoteEnd--><!--QuoteEEnd-->
Of course, the seeds of Orientalism had been sown long before.
<!--QuoteBegin-->QUOTE<!--QuoteEBegin-->http://en.wikipedia.org/wiki/Orientalism
The precise, original distinction between the "West" and the "East" is difficult to ascertain. Because of the Graeco-Persian, Athenian historians drew a sharp, distinguishing line between their civic culture and Persian despotism, but <b>the institutional distinction, between East and West, did not exist as a defined polarity before the Oriens- and Occidens-divided administration of the Emperor Diocletian's Roman Empire, </b>however<!--QuoteEnd--><!--QuoteEEnd-->