The Tubantes were a Germanic tribe, living in the eastern part of the Netherlands, north of the Rhine river. They are often equated to the Tuihanti, who are known from two inscriptions found near Hadrian's Wall. The modern name Twente derives from the word Tuihanti.
Little is known about the Tubantes. They are first mentioned in a description of the first expedition of Germanicus against the Marsi in 14 AD, when they, in coalition with the Bructeri and Usipetes, ambushed the Roman forces returning to their winter-quarters, probably somewhere in the Münsterland.
In 17 AD, the Tubantes are apparently referred to as the Tubattii, in Strabo's in a list of Germanic peoples defeated by Rome under Germanicus. After being vanquished by the Romans, some Tubantes were prisoners of Germanicus' triumphal procession.
In 58 AD, Tacitus reports in his Annals that the Ampsivarii, in their plea to the Romans concerning some land north of the Rhine reserved by the Roman military, that it had belonged in sequence to the Chamavi, Tubantes, and then the Usipii. (The Usipii are known to have moved into the Rhine region around the time of Caesar (55 BC), but not yet to have found permanent settlement in that time, and to have been resident at the afore-mentioned northern bank of the Rhine by the time of Drusus around 11 AD.)
Claudius Ptolemy in his Geographia (2.10), appears to describe a north to south series starting with the Chamavi "under" whom are the Chatti and Tubanti, and then between these and the Sudetes mountains, thought to be the Erzgebirge, the Teuriochaemae (an otherwise unknown name, but in the place previously inhabited by the Hermanduri and later by the Thuringii, with these three names often thought to be equivalent). But the position of the Chamavi and Tubantes so far to the southeast does not match other sources, and Chamavi also seem to be mentioned under another name in a more expected place, south of the coastal Chauci, and north of the Bructeri, in between Ems and Weser. Confusingly, other tribes normally from the region of the Tubantes, the Chattuari and Chasuarii, are also described as if they are in southern Germany in this passage.
Two third-century sacral inscriptions found near Hadrian's Wall make mention of Tuihanti serving in an auxiliary unit of the Roman army, the Cuneus Frisiorum. (The Frisii was a name applied to all or most tribes north of the Rhine in Roman times, in the same general area of the Tubantes.) The inscriptions say:
Archeology shows that the region associated with the Tubantes was inhabited more or less continuously since the last ice-age. The region is very fertile and will support agriculture and cattle. The countryside is marked by artificial hills, called es or esch, which were formed by depositing dung mixed with dirt. Prime examples include the Fleringer Esch, near Fleringen and the Usseler Es, also known as the Usseler Esch, near Usselo.
There is archeological evidence of (relatively) large scale iron production in the region, specifically near Heeten, indicating that the locals understood the process of producing steel, with a carbon content of 2% . The ore used was the abundant bog iron. The production sites can be dated to 280-350 AD.