The gens Maecilia or Mecilia was a minor plebeian family at ancient Rome.
Although of great antiquity, few members of this gens are mentioned in republican times, including two tribunes of the plebs in the first century of the Republic.
The Maecilii appear again, somewhat sporadically, in imperial times, even obtaining the consulship during the early fourth century.
One of the last emperors of the Western Empire was Marcus Maecilius Avitus.
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