Ptolemy Keraunos
The punishment inflicted by Ptolemy Keraunos on the Getae, however, induced the Triballi to sue for peace. About 279 BC, a host of Gauls (Scordisci) under Cerethrius defeated the Triballi with an army of 3,000 horsemen and 15,000 foot soldiers. The defeat pushed the Triballi further to the east. Nevertheless, they continued to cause trouble to the Roman governors of Macedonia for fifty years (135 BC–84 BC).