The Persians were an ancient human civilisation. A peri was a creature from their mythology which the Sixth Doctor referenced to his companion Peri. (TV: The Twin Dilemma)

Pythagoras learned from Persian magi in Babylon. (PROSE: The Pythagoras Problem)

Having saved Alexander the Great from androids, Time Agents Jack Harkness and John Hart claimed that the assassins were Persians. (AUDIO: The Death of Captain Jack)

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