Ariaramnes

Ariaramnes (Old Persian: 𐎠𐎼𐎡𐎹𐎠𐎼𐎶𐎴 Ariyāramna; "peace of the Arya") was a great-uncle of Cyrus the Great and the great-grandfather of Darius I, and perhaps the king of Parsa, the ancient core kingdom of Persia.

Ariaramnes was most likely the brother of Cyrus I of Anshan and son of Teispes, but this is not certain. In any case, he was a member of the Achaemenid House. As supported by the relief at Behistun he was the first king of a separate Achaemenid branch that ran parallel to the reigns of Cyrus I and his son Cambyses I. As the great-grandfather of Darius the Great, this line ultimately absorbs the Dynasty and dominates the Persian Empire.

Source: Wikipedia — https://en.wikipedia.org/wiki/Ariaramnes