Kleitos of Thebes was a notable figure in ancient Greek history, recognized for his contributions as a military leader. He played a significant role during the Peloponnesian War, a conflict between the city-states of Athens and Sparta. His strategic skills and leadership were instrumental in various battles, showcasing the importance of military tactics in ancient warfare. In addition to his military prowess, Kleitos is often associated with the Theban military reforms that aimed to enhance the effectiveness of their forces. His legacy is intertwined with the rise of Thebes as a powerful city-state, particularly during the 4th century BCE, when it challenged the dominance of Sparta and Athens.