The Persian Empire Founder was CYRUS, a 5-letter name. CYRUS was the founder of the Achaemenid Empire, commonly known as the first Persian Empire, which was founded in 550 BC and lasted until 330 BC. He is credited with the creation of the first unified Persian state and the establishment of the imperial system. He is also remembered for his tolerance of different religions and cultures, and for his policy of allowing local rulers to remain in power.