Kleitomachos won the three downing events at which Panhellenic Games of Ancient Greece?
Kleitomachos (athlete):  This latter achievement, victory in all three so-called "downing" events, was regarded as especially impressive, and was only achieved by one other athlete (Theagenes of Thasos). Isthmian Games: Isthmian Games or Isthmia (Ancient Greek: Ἴσθμια) were one of the Panhellenic Games of Ancient Greece, and were named after the Isthmus of Corinth, where they were held.
Isthmian Games