is described by Pliny (19.5
) as a “castellum Rheno impositum.” It is mentioned by Tacitus several times (Hist.
4.26, 32, 36, &c.), from whom we may collect that it was near Novesium. The Antonine Itin. places it on the left bank of the Rhine, on the road from Cologne
between Novesium (Neuss
) and Calo [CALO
The distances and the modern name, Gellep
determine the position of Gelduba.