a vision in which Darius had wings atop his shoulders and stood upon the confines of Europe and Asia (the known world). When Cyrus awoke from the dream, he inferred it as a great danger to the future security of the empire, as it meant that Darius would one day rule the whole world. However, his son Cambyses was the heir to the throne, not Darius, causing Cyrus to wonder if Darius was forming treasonable and ambitious designs. This led Cyrus to order Hystaspes to go back to Persis and watch over his son strictly, until Cyrus himself returned. Accession There are different accounts of the rise of Darius to the throne from both Darius himself and Greek historians. The oldest records report a convoluted sequence of events in which Cambyses II lost his mind, murdered his brother Bardiya, and was killed by an infected leg wound. After this, Darius and a group of six nobles traveled to Sikayauvati to kill an usurper, Gaumata, who had taken the throne by pretending to be Bardiya during the true king's absence. Darius's account, written at the Behistun Inscription, states that Cambyses II killed his own brother Bardiya, but that this murder was not known among the Iranian people. A would-be usurper named Gaumata came and lied to the people, stating he was Bardiya. The Iranians had grown rebellious against Cambyses's rule and on 11 March 522 BCE a revolt against Cambyses broke out in his absence. On 1 July, the Iranian people chose to be under the leadership of Gaumata, as "Bardiya". No member of the Achaemenid family would rise against Gaumata for the safety of their own life. Darius, who had served Cambyses as his lance-bearer until the deposed ruler's death, prayed for aid and in September 522 BCE, along with Otanes, Intaphrenes, Gobryas, Hydarnes, Megabyzus and Aspathines, killed Gaumata in the fortress of Sikayauvati. Herodotus provides a dubious account of Darius's ascension: Several days after Gaumata had been assassinated, Darius and the other six nobles discussed the fate of the empire. At first, the seven discussed the form of government; a democratic republic (Isonomia) was strongly pushed by Otanes, an oligarchy was pushed by Megabyzus, while Darius pushed for a monarchy. After stating that a republic would lead to corruption and internal fighting, while a monarchy would be led with a single-mindedness not possible in other governments, Darius was able