). Ptolemy (2.8.1
) places the Herius on the coast of Gallia Lugdunensis, between [p. 1.1057]
the Brivates Portus and the Vindana or Vidana Portus. Ptolemy's latitude of the mouth of the Herius (49 1/4°) makes it nearly as far north as the outlet of the Seine.
] supposes the Herius to be the Vilaine,
the first large river north of the Loire.
He adds (Notice, &c.,
Herius Fluv.) that the passage of the Vilaine
and the mouth of the river is now called Treig-hier,
and that we may readily believe Treig-hier
to be a corruption of Trajectum Herii.
This may be so; or Treig-hier
may be the old Celtic name. Some geographers assume the Herius to be the small river Auray
north of the Vilaine;
but this is only a guess like the other. [G.L