Who was a populist politician and the effective ruler of Athens when Admetus was King of the Molossians?
Admetus of Epirus: Admetus (Greek: Αδμητος ) (before 470-430 BC) was a Greek king of the Molossians at the time that Themistocles (524–459 BC) was the effective ruler of Athens. Themistocles:  As a politician, Themistocles was a populist, having the support of lower-class Athenians, and generally being at odds with the Athenian nobility.
Themistocles