a Macedonian, governor of Paeonia for Philip V., was employed by Perseus to insinuate himself into the confidence of his younger brother, Demetrius, for the purpose of betraying him. When Demetrius, aware that he was suspected by his father, determined to take refuge with the Romans, Didas gave information of the design to Perseus, who used it as a handle for accusing his brother to the king. Philip, having resolved to put Demetrius to death, employed Didas as his instrument, and he removed the prince by poison B. C. 181.
He is afterwards mentioned as commanding the Paeonian forces for Perseus in his war with the Romans, B. C. 171. (Liv. 40.21