2. One of the leading chiefs of the Treviri (Trèues, Trier), and the head of the independent party. When Caesar marched into the territory of the Treviri in B. C. 54, just before his second invasion of Britain, Indutiomarus, who had made every preparation for war, found himself deserted by many of his partizans, and was obliged to submit to Caesar. The latter accepted his excuses, but at the same time used all his influence to induce the leading men of the nation to side with Cingetorix, the great rival of Indutiomarus, (though he was his own son-in-law,) and the head of the Roman party. Finding himself thus deprived of much of his power among his own people, Indutiomarus became a bitterer enemy than ever of the Romans, and only waited for a favourable opportunity of taking his revenge. This arrived sooner than might have been expected. In consequence of the scarcity of corn Caesar was obliged to separate his troops for their winter-quarters, and to station them in different parts of Gaul. Indutiomarus immediately urged on Ambiorix and Cativolcus, chiefs of the Eburones, to attack the Roman legion stationed in their country; and he himself soon afterwards marched against Labienus, who was encamped among the Remi, on the confines of the Treviri, but deterred by Caesar's victory over the Nervii, he withdrew into his own country, Here he raised fresh troops, and again marched against Labienus, whose camp he surrounded; but being surprised by a sudden sally, his troops were put to flight, and he himself was killed in the rout while crossing a river. His death was deeply felt by his people. (Caes. Gal. 5.3, 26, 53, 55, 58; D. C. 40.11, 31.)