What the heck is a Decapolite

Looking at the saint of the day "Gregory the Decapolite" I wondered if he had lost his head (decapitated), sat on something strange (like a stylite), or lived somewhere in particular (Athonite).

It seems he, somewhat of a letdown here, that he was from Decapolis.

Wikipedia: The Decapolis (Greek: deka, ten; polis, city) was a group of ten cities on the eastern frontier of the Roman Empire in Jordan Syria and Palestine. The ten cities were not an official league or political unit, but they were grouped together because of their language, culture, location, and political status. The Decapolis cities were centers of Greek and Roman culture in a region that was otherwise Semitic (Nabatean, Aramean, and Jewish). With the exception of Damascus, the "Region of the Decapolis" was located in modern-day Jordan, one of them located west of the Jordan River in Palestine (modern day Israel). Each city had a certain degree of autonomy and self-rule.

Here is his history from the Greek Orthodox archdiocese website (certainly the best Orthodox website out there in my thinking):

Saint Gregory who was from Irenopolis of the Decapolis of Asia Minor, was the son of Sergius and Mary. He became a monk as a young man, and after struggling for many years in virtue and prayer under obedience to a wise spiritual father, he was informed by revelation that it was the will of God for him to live, like the Patriarch Abraham, with no certain dwelling, moving from place to place. His journeyings took him to Ephesus, Constantinople, Corinth, Rome, Sicily, Thessalonica, and again to Constantinople, where, after many labours in defence of Orthodoxy against Iconoclasm, he reposed in peace in the first half of the ninth century. He had two disciples, one of whom was Saint Joseph the Hymnographer (see Apr. 3), who wrote the Menaion service for Saint Gregory, his father in Christ.

I like the GOA Australia website's version a bit more.

St Gregory the Decapolite was born in the city of Isaurian Decapolis (ten cities) in the eighth century. From his childhood, he loved the temple of God and church services. He read the Holy Scripture constantly and with reverence. In order to avoid the marriage which his parents had intended for him, he secretly left home. He spent all his life wandering in Constantinople, Rome, Corinth, and he pursued asceticism for a certain while on Olympos. St Gregory preached the Word of God everywhere, denouncing the Iconoclast heresy, strengthening the faith and fortitude of the Orthodox, whom the heretics in those times oppressed, tortured and imprisoned.

Through his ascetic effort and prayer, God gifted St Gregory with prophecy and wonderworking. Having attained purity of heart, he was granted to hear angelic singing in praise of the Holy Trinity. To better contend against the Iconoclast heresy, St Gregory left the monastery of St Menas where he had laboured for a long while, and he went again to Constantinople. At the capital, a grievous illness undermined his strength, and he departed to the Lord in 816 AD.