ξυστάρχ-ης · xystarch-ēs — LSJ
president of an athletic association
president of an athletic association, ὃν βασιλῆς . . στῆσαν ἀεθλοθέτην ξυστάρχην IG 3.1171, cf. POxy. 1050.7 (ii/iii A. D.), Sammelb. 5725, etc. ; διὰ βίου ξ. IGRom. 4.1215 (Smyrna), IG 14.1102, al.