ACHAIA Propria, anciently a small district in the north of Peloponnese, running westward along the bay of Corinth, and bounded on the west by the Ionian
Sea, on the south by Elis and Arcadia, and on the east by Sicyonia: inhabitants, the Achæans, properly so called; its metropolis, Patra. It is now called Romania Alta, in the Morea.
Achaia was also taken for all those countries that joined in the Achæan league, reduced by the Romans to a province. Likewise for Peloponnese.