Aschaffenburg (anc. Hercynia), a fortified town in the district of Unterfranken, Bavaria, Germany, on the river Main, 24 miles from Frankfort. The cathedral, a fine building, dates from the tenth, and the Castle of Johannesberg from the seventeenth century. There are a Lyceum, royal library, Capuchin monastery, and a Catholic foundation called the "Insignis Collegiata," or "Stiftskirche." Some shipbuilding is carried on, and there are manufactories of paper, woollens, straw-plaiting, and tobacco. It has a station on the Bavarian State Railway.