Tasgetius, the Latinized form of Gaulish Tasgetios or Tasgiitios (d. 54 BC), was a ruler of the Carnutes, a Celtic polity whose territory corresponded roughly with the modern French departments of Eure-et-Loir, Loiret, and Loir-et-Cher. Julius Caesar says that as Roman proconsul he made Tasgetius king in reward for his support during the Gallic Wars. His reign would have begun in late 57 BC, following Caesar's campaign against the Belgic "civitates" in northern Gaul that year; it ended with his assassination in 54 BC. The overthrow of a king appointed by Caesar was one of the precipitating events that led to the pan-Gallic rebellion of 52 BC under the Arvernian leader Vercingetorix.