Cyrus I in Wikipedia

(Old Persian Kuruš), was King of Anshan in Persia from c. 600 to 580 BC or, according to others, from c. 652 to 600 BC. He should not be confused with his famous grandson Cyrus the Great, also known as Cyrus II. His name in Modern Persian is کوروش, while in Greek he was called Κύρος. Cyrus was an early member of the Achaemenid dynasty. He was apparently a grandson of its founder Achaemenes and son of Teispes, king of Anshan. Teispes' sons reportedly divided the kingdom among them after his death. Cyrus reigned as king of Anshan while his brother Ariaramnes was king of Parsa. The chronological placement of this event is uncertain. This is due to his suggested but still debated identification with the monarch known as "Kuras of Parsumas". Kuras is first mentioned c. 652 BC. At that year Shamash-shum-ukin, king of Babylon (668 - 648 BC) revolted against his older brother and overlord Ashurbanipal, of king of Assyria (668 - 627 BC). Cyrus is mentioned being in a military alliance with the former. The war between the two brothers ended in 648 BC with the defeat and reported suicide of Shamash-shum- ukin. Cyrus is mentioned again in 639 BC. At that year Ashurbanibal managed to defeat Elam and became overlord to several of its former allies. Kuras was apparently among them. His elder son "Arukku" was reportedly sent to Assyria to pay tribute to its King. Kuras then seems to vanish from historical record. His suggested identification with Cyrus would help connect the Achaemenid dynasty to the major events of the 7th century BC...