sentences:  These inventions were very important reasons behind the success of the empire.The Mykians of the other side of ancient Maka, the present day region of Balochistan and Sindh, are thought to have later become independent, as they are not mentioned in Arrian of Nicomedia's account of the campaigns of Alexander the Great; he mentions only the Omani side of Maka, which he calls "Maketa".The reasons for this may have been the arguably unjust rule of Xerxes.