This is one of the positions in the Roman Itins. along the Rhine. They place it between Helvetum or Helcebus [HKLCEBUS] and Urunci.
There is no doubt that is Vieux-Brisach
as the Germans call it. All the positions of the Itins. on the Rhine are on the west or Gallic side of the river, but Vieux-Brisach
is on the east side. The Rhine has changed its bed in several parts, and this is one of the places where there has been a change. Breisach
is described by Luitprand of Pavia (quoted by D'Anville), as being in the tenth century surrounded by the Rhine “in modum insulae.” It may have been on an island in the Roman period.
The hill (mons) of Altbreisach
is a well marked position, and was once crowned by a citadel. Altbreisach
is now in the duchy of Baden, and opposite to Neubreisach
on the French side of the Rhine.