(Σίμων), a Thracian prince, was connected by marriage with Amadocus, who appears to have been a son of Cotys [No. 2], and brother to Cersobleptes and Berisades. On the death of the latter, when Cersobleptes wished, with the aid of Charidemus, to seize all the dominions of Cotys, and to exclude Amadocus and the children of Berisades from their inheritance, Simon was prepared to assist Amadocus against the intended usurpation; and, according to Demosthenes, the remarkable decree of Aristocrates in favour of Charidemus (B. C. 352) was framed with the view of disarming this opposition, especially as Simon had been honoured with the Athenian franchise. (Dem. c. Aristocr. pp. 624, 625, 680, 683.) [CERSOBLEPTES ; CHARIDEMUS.]