Gaius Judacilius or Gaius Vidacilius was a native of Asculum in Picenum, and one of the chief generals of the allies in the Social War, 90 BC. He was known to have been one of the ablest and most resolute leaders of the insurrection. He first commanded in Apulia where he was very successful: Canusium and Venusia, with many other towns, opened their gates to him, and some which refused to obey him he took by force. He executed the Roman nobles who were made prisoners, and enrolled the common people and slaves among his troops.