Iulius Obsequens is believed to have lived in the middle of the 4th century. The only work associated with his name is the Liber de prodigiis (Book of Prodigies), an account of the wonders and portents that occurred in Rome between 249 BC - 12 BC.

Liber de prodigiis
130 BC - Lupus et canis Hostiae pugnantes fulmine exanimatae. 130 BC - In Ostia a wolf and dog that were fighting were killed by a bolt of lightning.
44 BC - Hostiae grex piscium in sicco reciproco maris fluxu relictus. 44 BC - In Ostia a shoal of fish was left on dry land by the retracting of the sea.