Passau (Latin: Batavia) is a town in Niederbayern, Eastern Bavaria, Germany, known also as the Dreiflüssestadt (City of Three Rivers), because the Danube River is joined there by the Inn River from the South, and the Ilz River coming out of the Bavarian Forest to the North.
The town is dominated by the Veste Oberhaus and the former fortress of the Bishop, on the mountain crest between the Danube and the Ilz rivers.
At Lorch, a Roman station and an important stronghold at the junction of the Enns and the Danube, Christianity found a foothold in the third century, during a period of Roman domination, and a Bishop of Lorch certainly existed in the fourth.
This diocese was afterwards further enlarged at the expense of Passau by Sixtus IV.
Under Wolfgang the Peace of Passau was concluded, in the summer of 1552 (see CHARLES V).