an ancient town of Germany, situated ALTENBURG situated on the river Pleiss, with a good castle placed on a rock, in Misnia, in the circle of Upper Saxony. It was formerly an imperial city, but at present belongs to the house of Saxony. Here is a college which has always been in a flourishing condition. In 1705, there was a nunnery founded for women of a high rank, who are Protestants. E. Long. 15. 8. N. Lat. 50. 59.