During the 4th century, Aquileia maintained its importance. Constantine sojourned there on numerous occasions. It became a naval station and the seat of the "Corrector Venetiarum et Histriae"; a mint was established, of which the coins were very numerous, and the bishop obtained the rank of metropolitan archbishop. A council held in the city in 381 was only the first of a series of Councils of Aquileia that have been convened over the centuries. However, the city played a part in the struggles between the rulers of the 4th century. In 340, the emperor Constantine II was killed nearby while invading the territory of his younger brother Constans.