Solon (in 594 BC), Cleisthenes (in 508/7 BC), and Ephialtes (in 462 BC) contributed to the development of Athenian democracy. Cleisthenes broke up the power of the nobility by organizing citizens into ten groups based on where they lived, rather than on their wealth.
I would say that Pericles was a strong advocate for Athenian democracy though it had been existence before him and he promoted the ability of citizens to participate in the functioning of their government. I would also say that the current Prime Minister or Alexis Tsipras believes in true democracy and a government that really tries to serve the vast majority of the people by refusing to allow the debt to the European Union to overshadow the social needs of the Greek people.
