On This Day: The End of Rome’s Safe Sailing Season
Mid-August—Roman captains eye the sky. The safe sailing season on the Mediterranean is nearly over.
Pieter Bruegel the Elder — "The Harvesters" (1565), public domain
The Mediterranean’s mood shifts.
By mid-August, Roman traders and captains watch the horizon for signs of change. The ancient sailing calendar warned: already, storms gather faster, and the sea turns treacherous.
Sea lanes close, and anxiety rises.
The official close of the ‘mare apertum’—open sea season—was September 14, but by now, most wise captains rushed for harbor. Ships carrying grain from Alexandria or messages from distant governors weighed Roman fortunes in their holds and on the mercy of fickle weather.
When storms ruled the empire.
A single late-summer squall could starve a city or sink a fortune. Even emperors fretted. Augustus himself boasted of braving the dangerous seas—others weren’t so lucky.
After August, every ship risked wreck on the whim of a storm. Rome’s lifeblood—grain, news, the emperor’s orders—was at the mercy of the sea.
