In October 539 BC, when Cyrus the Great conquered the Neo-Babylonian empire, he faced surprisingly little resistance, for which various explanations have been found, suggesting the unpopularity the favoritism the previous Babylonian monarch Nabonidus had for the god Sin over Babylon's traditional patron deity Marduk and his stays in Timna, an oasis in Arabia and parts of Sumer, and Harran, the cult center of Sin and a prominent Assyrian city. It is believed that after some resistance, a battle was fought near Opis, and Cyrus captured Sippar. The Nabonidus Chronicle claims Babylon was taken without battle, while Greek historians claim otherwise. Whatever the case, one stratagem used to capture Babylon, was that Cyrus diverted the waters of the Euphrates so that he could more easily take the city. Herodotus mentions an incident in which one of the sacred white horses drowned while trying to cross a stream, that was a tributary of the Tigris river. What if Cyrus himself accidentally drowned there and died? His empire is quite recent and the Medes and Lydians have only been recently subjugated, this is about a generation before the administrative reforms of Darius, but I don't follow up my what if with a Persian collapse. Is there a chance for the Achaemenids to keep the gains they've already made? Who would be regent for Cambyses, or is he old enough to rule on his own, assuming there aren't any sons we don't know about? Would Babylon still fall, considering how unpopular Nabonidus was, or would the army retreat back to Persia? If Babylon still falls, does Nabonidus, or his son Belshazzar, or any of his relatives and generals try to continue resistance in the north, in Assyria and the Levant? Does Amasis II take advantage of the chaos to absorb more territory in the Levant and Syria? Would the inevitable rebellions that would come succeed, or would they eventually be crushed? More importantly, do the Achaemenids manage to survive the crisis, or do they collapse or face a general retention of their power, or get dethroned entirely, with either a retention to a pre-Achaemenid geopolitical framework or an altered post-Achaemenid geopolitical situation? If they do manage to survive, how does this affect the development of Achaemenid governance and ideology, and the development of Zoroastrianism? What would be the effect of no conspiracy of the seven and no Darius, and with Bardiya still alive and no Gaumata conspiracy(yes, I'm aware it's entirely possible he was the real brother of Cambyses)? And how does this affect the Greco-Persian wars, do the cities of Ionia rebel, or are the campaigns of Harpagus and Mazares too recent? And what would the situation on the steppe look like? I am unsure if Astyages, the deposed Median leader, is still around, but there are plenty of figureheads for a renewed Mede revolt that, if it takes longer and more effort to crush it than the rebellions after the accession of Darius, could it end their important role in the new Achaemenid elite? And how capable is the younger Cambyses and his advisors in this situation? What would happen in mainland Greece, and would men like Polycrates, the tyrant of Samos, be able to expand their power? Also, how would the Jews be affected? Would a similar ceremonial capital like Persepolis still get founded? Would Cyrus' body get recovered? What would be the effect on India?
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