What philanthropic Roman emperor ruled during the time of the group of ten cities on the eastern frontier of the Roman Empire that were centers of Greek and Roman culture in an otherwise Semitic-speaking region?
Decapolis: The Decapolis (Greek: Δεκάπολις "Dekápolis", Ten Cities) was a group of ten cities on the eastern frontier of the Roman Empire in the southeastern Levant. Trajan:  He is also known for his philanthropic rule, overseeing extensive public building programs and implementing social welfare policies, which earned him his enduring reputation as the second of the Five Good Emperors who presided over an era of peace and prosperity in the Mediterranean world.
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