c. 406–390 BC) was an ancient Roman commander who was the son of Marcus Fabius Ambustus, and brother to Caeso and Quintus.
In 406 BC, he and his forces captured the Volscian city of Anxur (modern Terracina) by securing the high ground above the town, from which they were able to launch attacks against its walls.
After the victory, his forces began to torture the inhabitants of the city in retaliation for the Volscian massacre of the Roman garrison at Verrugo, thought to be located in the Trerus valley, (modern Sacco river valley) of the Lazio region, and where the Roman prisoners had been horribly tortured.
Numerius eventually showed mercy, and around 2500 Volscians were permitted to surrender with their lives.
When the Roman Senate refused to give up the guilty parties, the Gauls marched against Rome, which they sacked after the battle of the Allia.