Case file · Sighting
Burning shield over Tarquinia
Julius Obsequens and Pliny record that in the consulship of Gaius Marius and Lucius Valerius (100 BC) a round, shield-like object crossed the sky from west to east at sunset, scattering sparks; Obsequens places it at Tarquinia.
100 BCE · 42.25, 11.76 · status: legend
The sceptical view
A bright fireball (bolide) moving across the sky matches the description well.