Paus. 6.12.7 mentions a family of charioteers, three generations to be precise: the 'grandfather' and 'son' were both named Theochrestos and won in the Olympics. The father - the middle generation - remains unnamed, who won at Isthmia (see ID 504 in this database). Moretti (1957), no. 428 argues that both Theochrestos I (the grandfather) and Theochrestos II were likely to have lived and won their victories in the course of the 4th century BC (hence our estimation for Theochrestos II's victory: ca. 325-275 BC). He suggests Theochrestos II's victory to have taken place at the 120th Olympiad (= 300 BC).
SEG 9.77 (=SEG 26.1831 = SEG 29.1673 = SEG 38.1892) record a certain Mnasarchos, son of Theochrestos, who was a strategos, and identify him as the father of Theochrestos II mentioned by Pausanias. However, Moretti is correct to note that Theochrestos is quite a common name in Kyrene, so we cannot be certain. [DvdL]