CALIDIUS, MARCUS, Roman orator. His first speech of which we know was delivered in 64 B.C. against Gallius, who was defended by Cicero, for bribery. He was praetor in 57, and spoke in favour of Cicero's return and the restoration of his house. In the disturbances after Clodius' death he was a partisan of Milo. In the debate in the Senate in Jan. 49 he urged that Pompey should leave for his provinces to avoid war. On the outbreak of the Civil War he joined Caesar, who made him governor of Gallia Togata, where he remained till his death, at Placentia, in 48 B.C.