Themistocles was an Athenian statesman and general who played a significant role in the Greek city-states' resistance against the Persian invasion during the early 5th century BC. He was known for his strategic acumen and leadership in the naval battles of Artemisium and Salamis, which were crucial in thwarting the Persian advance. Themistocles also championed the development of the Athenian navy, recognizing its importance in securing Athens' power and influence in the region. His political career was marked by both triumphs and controversies, and he eventually fell out of favor and was exiled from Athens. Nonetheless, his contributions to the defense and growth of Athens left a lasting impact on ancient Greek history.