Latin for "for the Batavi". The Batavi were an ancient Germanic tribe from area of the Rhine delta who frequently served in the Roman army as auxiliary troops. Batavis (Passau-Altstadt) was a Roman castrum in the province of Raetia, while another late Roman castrum, Boiotro (Passau-Innstadt), was in the province of Noricum.

During the second half of the 5th century, St. Severinus