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Which dialect did Herodotus use for prose writing?

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Herodotus, often referred to as the "father of history," wrote his prose in the Ionic dialect.

During the 6th century BCE, the Ionic dialect became the standard for early Greek prose due to the significant cultural and political prestige of the Ionian region. Herodotus, along with other notable figures such as the philosopher Heracleitus and the physician Hippocrates, utilized this dialect for their writings. However, by the end of the 5th century BCE, Ionic was gradually supplanted in prose by the Attic dialect as the influence of Athens grew.12