The Classis Germanica was a Roman fleet in Germania Superior and Germania Inferior. Besides the Channel Fleet (Classis Britannica), it was one of the largest naval forces of the Roman Empire, ranking above all other provincial fleets.
The fleet was assembled in 13 BC, and was responsible for monitoring the entire Rhine from the confluence of the Vinxtbach and its navigable tributaries as well as the Zuiderzee and North Sea coastlines in the Rhine–Meuse–Scheldt delta. Later on, the estuaries on the right bank of the Rhine were also included in its charter in order to maintain a smooth flow of transportation and commerce on the river. The allegiance of the Classis Germanica to the Army of Germania Inferior (Exercitus Germaniae Inferioris) was confirmed by a Roman military diploma (located in the Netherlands) during Trajan's reign.[1] Besides specifying the local auxiliary troops involved, it also lists the Rhine fleet, that likely was still in existence (in altered form) until the 4th century.