Question: 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?
Sentence (from "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.
Relevant evidence: Yes