context: With the death of Pericles, Athens had lost its clear lead. The new, more militant line began to be pushed by Pericles biggest opponent Kleon. The strategy of Athens then became much more aggressive, and in 427 BC. the Athenian strategist Nikias conquered the island of Minoa, from which he could block the port of Megara. [12]
question: Who was Kleon?
answers.text: Pericles biggest opponent