name taken for that part of Greece cap 56a, which Ptolemy calls Hellas; the younger Pliny, Graecia; now called Livadia: bounded on the north by Thessaly, the river Sperchius, the Sinus Maliacus, and Mount Oeta; on the west by the river Achelous; on the east, turning a little to the north, it is washed by the Archipelago, down to the promontory of Sunium; on the south, joined to Peloponnesus, or the Morea, by the isthmus of Corinth, five miles broad. ACHAIÆ Propria, anciently a small district in the north of Peloponnesus, 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 Achaeans, properly so called; its metropolis Patrae. It is now called Romania Alta, in the Morea.

ACHAIÆ was also taken for all those countries that joined in the Achaean league, reduced by the Romans to a province. Likewise for Peloponnesus.

ACHAIÆ Presbyteri, or the Presbyters of Achaia, were those who were present at the martyrdom of St Andrew the apostle, A.D. 59; and are said to have written an epistle in relation to it. Bellarmine, and several other eminent writers in the church of Rome, allow it to be genuine; while Du Pin, and some others, expressly reject it.