The Roman Empire conquered Lazica in the 1st century AD; however, the Romans exercise little control over the hinterland of Abkhazia. According to Arrian, the Abasgoi and Apsilae peoples were nominal Roman subjects, and there was a small Roman outpost in Dioscurias. After the 4th century Lazica regained a measure of independence, but remained within the Byzantine Empire's sphere of influence. Anacopia was the principality's capital. The country was mostly Christian, with the archbishop's seat in Pityus. Although the exact time when the population of the region of Abkhazia was converted to Christianity has not been determined, it is known that Stratophilus, the Metropolitan of Pityus, participated in the First Council of Nicaea in 325. According to an Eastern tradition Simon the Zealot died in Abkhazia having come there on a missionary trip and was buried in Nicopsis.