Thumelicus (born 15 AD; died before 47 AD, probably in 30 or 31) was the son of the Cherusci leader Arminius and of Thusnelda, daughter of the pro-Roman tribal leader Segestes.
In May, 15 AD, Arminius besieged Segestes at his stronghold, where Thusnelda, then pregnant, was staying. The Roman commander, Germanicus, nephew of Emperor Tiberius, broke through the siege and captured her. She and the infant Thumelicus were presented in Rome in the Triumph Germanicus was allowed to celebrate in May, 17 AD . Afterwards, the two were not killed, but sent to exile in Ravenna, where Thumelicus probably was raised and trained as a gladiator.
Tacitus promises to recount his fate "at the proper time," i.e., when his Annals treat the year in question—but there is no further mention in the extant copy. There is a major gap for 30 and 31 AD, however, so it could be that Thumelicus was killed at the age of 15 or 16.