The Roman Map of Britain River Trent

Intraum Antrum (R&C 256) next
Gabrantouikwn eulimenoV kolpoV Gabrantvicum (Ptolemy II 3 4)
ProV oiV para ton eulimenon kolpon Parisoi, kae polis Petouaria (Ptolemy II 3 10)
castris Antonam et Sabrinam fluvios (Tacitus Annals xii 31, emended by Bradley to cis Trisantonam et Sabrinam fluvios)

Ptolemy's Abus has long been associated with the Yorkshire Ouse and the Humber. Ptolemy records the Parisi as situated beside a 'gulf suitable for a harbor' eulimenon kolpon. The 'Gulf of the Gabrantovices' was identically recorded as eulimenosV kolpoV. Unfortunately the mis-identification of Abus has obscured the truth. Gabranto- is too similar to Tarranto- Tarranto- to be anything else but the Trent. Thus the correct form should be Tarrantoouikou eulimenoV kolpoV 'the Gulf of the Trent suitable for a harbor'. While the Yorkshire Ouse may currently be considered the major tributary of the Humber, the perception two thousand years ago may have been entirely different.

The Ravenna Cosmography's entry is rather mangled, -traum A- is unclear, but recognizable. Traanta or T 'ranta (Tarranta)? Bede records the Trent as Treenta and Treanta.