in Britain, a river mentioned by Ptolemy (2.3.4
) as lying west of the outlet of the Tamarus
In the Monumenta Britannica, Isacae ostia are identified with Weymouth,
and also with Exmouth;
most probably the latter, name for name, as well as place for place.
In the Geographer of Ravenna the form. is Isca, which is preferable. [ISCA