The name of the ancient Greek philosopher Diogenes is known to everyone, as is his unusual behavior, which often went beyond the bounds of reasonable and decent. But why did Diogenes behave this way? What made him leave his native Sinope in Asia Minor and seek refuge in Athens? How did his contemporaries treat him—primarily his fellow philosophers, whom he mercilessly ridiculed? How does his colorful personality fit into the history of Greece during the crisis of polis democracy in the 4th century BC? You can read about all this in the book of the famous historian of antiquity Igor Surikov.