Castra Gelduba

thumb|Pottery from Gelduba Gelduba was a location in ancient Germania Inferior, the modern site of Gellep in North Rhine-Westphalia.

A cemetery at the site was in use at least from the reign of Nero (AD 54–68). Tacitus mentions the place as the site of a Roman camp and a battle during the revolt of the Batavians in 69–70. Afterwards, a was built there, according to Pliny's Natural History. The original fort of wood and earth went through three stages before it was converted to stone by 150. It was held by the . It was destroyed by the Franks after the revolt of Postumus in 259 and again in 275–276. Under the Tetrarchy, it was rebuilt with only a rampart of stone. In 295, it was raised to a . In 353–355, during the reign of Magnentius, it was again destroyed by the Franks. Valentinian I () had it rebuilt. Around 380, semicircular towers and new ditches were added. It continued in use as a Roman fortress until at least the 5th century.