The Roman Map of Britain Rex Tamesa River Thames
Raxtomessa
(R&C 268) next
Iamhsa Iamesa
var. Iamissa Iamissa
(Ptolemy II
3 4)
Iamhsa
Iamesa (Ptolemy II 3 11)
Tamesis (Caesar de Bello Gallico v
11 8)
Tamesim (Caesar de Bello Gallico v
18 1)
Tamesae (Tacitus Annals xiv
32)
Tamesam (Cassius Dio xl 21
3, lx 2 5)
Tamesae (Cassius Dio lx 21
3)
Tamensem vars. Tamensim, Thamesim (Orosius vi
9 6)
Rex Tamesa 'chief (river of Britain) Tamesa' has a precedent in the work of Vergilius Maro (70-19 bc) referring to the river Po of Italy as rex Eridanus.
This was one of my earliest important finds. One must wonder why so little time was spent on the river list.