WORLD CIVILIZATION

Detailed explanation-1: -Cambyses thus became the sole ruler of the vast Achaemenid Empire, facing no reported opposition. His relatively brief reign was marked by his conquests in North Africa, notably Egypt, which he conquered after his victory over the Egyptian pharaoh Psamtik III ( r. 526–525 BC) at the battle of Pelusium in 525 BC.

Detailed explanation-2: -Cyrus is remembered in history because of his political philosophy of tolerance and respect toward non-Persians and his demonstration of mercy on his defeated foe. After establishing his empire, Cyrus allowed all subjects to participate in governance.

Detailed explanation-3: -Cambyses 530-522BC King Cambyses II – main achievement was conquering Egypt.