Paeanius was a late Roman Empire historian, author of a translation into Greek language

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 of the Latin Breviarium historiae Romanae, the historical work of Eutropius.

The Breviarium was completed by Eutropius within 369: Paeanius' translation appeared before 380. The Breviarium was a compendium of ancient Roman history, used both as a textbook in schools and as a fast course on Roman history for the higher social classes (it was dedicated to Emperor Valens

Valens

Valens was the Eastern Roman Emperor from 364 to 378. He was given the eastern half of the empire by his brother Valentinian I after the latter's accession to the throne...

): Paeanius' translation allowed Greek-speaking people to have a graceful version of this compendium.