section_path: Military
section_name: Military
paragraph_text: Military
  
  Despite its humble origins in Persis, the empire reached an enormous size under the leadership of Cyrus the Great. Cyrus created a multi-state empire where he allowed regional rulers, satraps, to rule as his proxy over a certain designated area of his empire called a satrapy. The basic rule of governance was based upon loyalty and obedience of each satrapy to the central power, or the king, and compliance with tax laws. Due to the ethno-cultural diversity of the subject nations under the rule of Persia, its enormous geographic size, and the constant struggle for power by regional competitors, the creation of a professional army was necessary for both maintenance of the peace and to enforce the authority of the king in cases of rebellion and foreign threat. Cyrus managed to create a strong land army, using it to advance in his campaigns in Babylonia, Lydia, and Asia Minor, which after his death was used by his son Cambyses II, in Egypt against Psamtik III. Cyrus would die battling a local Iranian insurgency in the empire, before he could have a chance to develop a naval force. That task would fall to Darius I, who would officially give Persians their own royal navy to allow them to engage their enemies on multiple seas of this vast empire, from the Black Sea and the Aegean Sea, to the Persian Gulf, Ionian Sea and the Mediterranean Sea.