CRUSTUMERIUM, an ancient town of Latium, on the edge of the Sabine territory, near the headwaters of the Allia, not far from the Tiber. Rome conquered it in 50o B.C. according to Livy, the tribes Crustumina (or Clustumina) being formed in 471 B.C. Pliny mentions it among the lost cities, but the name clung to the fertile district around it. The site is unknown.