EIDUMANNIA
EIDUMANNIA in Britain, mentioned by Ptolemy (
2.3.6) as a river between the prominence to the south of the Garrienus (
Yare) and
Orford Ness, and the
Ἰάμισσα εἴσχυσις (
sic in the current editions). Whatever may be the reading, this
Ἰάμισσα means the
Thames. Hence, the
Stour, Orwell, Blackwater, or any of the Essex rivers may be the Eidumannia. The
Black-water is the best; in which case the
du==the Welsh
du, Gaelic
dubh==black. [
R.G.L]