Aquila, Abruzzo, the capital of the province of Abruzzo Ulteriore II. (also called Aquila), 56 miles northeast of Rome, on the river Aterno, a well-built and prettily-situated town, founded by the Emperor Frederick II. on the ruins of Amiternum, the birthplace of Sallust. The chief articles of trade are paper, linen, wax, and saffron. The province has an area of 2,509 square, miles.