In 139 BC, after a long war against the Romans, Viriathus was killed in his sleep by Audax (Latin meaning audacious), Ditalcus and Minurus (Latin meaning diminish), who had been sent as emissaries to the Romans and had been bribed by Marcus Popillius Lenas. The Roman general Servilius Cipianus had them executed, declaring "Rome does not pay traitors". According to Appian, Servilius Cipianus had paid them and sent them to Rome to collect the rest of the promised payment.
Diodorus says the third killer (Minurus) is called Nicorontes, while Appian calls him Minouros. Another account by Sextus Aurelius Victor says that Caepio paid two royal guards ("satellites") to kill Viriathus.