Achaicus may refer to one of several people:Lucius Mummius Achaicus, a 2nd century BCE Roman statesman and generalAchaicus, a Corinthian Christian, who according to the Bible, together with Fortunatus and Stephanas, carried a letter from the Corinthians to St. Paul, and from St. Paul to the CorinthiansAchaicus, a philosopher who wrote a work on Ethics. His time is unknown.
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