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The First Persian Invasion of Greece was an attempt by the Persian Empire to punish Athens and Eretria for their involvement in its internal affairs. It was also an effort to spread the influence of Persia throughout the Aegean Sea and into Greece. The first Persian Invasion of Greece was almost a complete success apart from the defeat at Marathon. The impact of the invasion on Athens was profound and it energized the city-state. The Persian invasion and its subsequent defeat meant that Athenian democracy was strengthened, it led to a cultural flourishing, changes in the military and the development of a large Athenian navy.