Gaius Julius Arminius, also known as Arminius, Armin or Hermann (b. 18 BC/17 BC in Magna Germania; d. AD 21 in Germania) was a chieftain of the Cherusci who defeated a Roman army in the Battle of the Teutoburg Forest. His influence held an allied coalition of Germanic tribes together in opposition to the Romans but after decisive defeats to the Roman general Germanicus, nephew of the Emperor Tiberius, his influence waned and he was assassinated on the orders of rival Germanic chiefs. Although Arminius was ultimately unsuccessful in forging unity among the Germanic tribes, the loss of the Roman legions in the Teutoburg forest had a far-reaching effect on the subsequent history of both the ancient Germanic tribes and on the Roman Empire. Germanicus' campaign was the last major Roman military effort east of the Rhine.