The first intervention of Rome in the region dates from 63 BCE, following the end of the Third Mithridatic War, when Rome established the province of Syria. After the defeat of Mithridates VI of Pontus, Pompey sacked Jerusalem and installed Hasmonean prince Hyrcanus II as Ethnarch and High Priest but not as king. Some years later Julius Caesar appointed Antipater the Idumaean, also known as "Antipas", as the first Roman Procurator. Antipater's son Herod was designated "King of the Jews" by the Roman Senate in 40 BCE but he did not gain military control until 37 BCE. During his reign the last representatives of the Hasmoneans were eliminated, and the huge port of Caesarea Maritima was built.