Aschaffenburg, a city of Bavaria, in the circle of Lower Franconia, on the right bank of the river Main, which is here crossed by a handsome stone bridge, 23 m. E. S. E. of Frankfort; pop. in 1871, 9,212. It has a fine palace, the Johannisburg, formerly the residence of the electors of Mentz. Among the other notable buildings are the Stiff's Kirche, erected in 980, and the Pompejanum or Pompeian house, which Louis I. built from 1842 to 1849 in imitation of the house of Castor and Pollux at Pompeii. Aschaffenburg was a town as early as the 8th century, and in the middle ages often appears in history. During the war between Prussia and Austria, in 1866, an engagement took place at Aschaffenburg on July 14, in which the Austrians were defeated, and 2,000 of their troops were cut off from retreat and captured in the city.