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In Dune (1965), Leto II's father Paul Atreides overthrows Padishah Emperor Shaddam IV when Paul's fierce Fremen army manages to defeat Shaddam's previously-unstoppable Sardaukar forces.
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As Frank Herbert's Dune (1965) begins, the known universe is ruled by Shaddam IV, the 81st Padishah Emperor of House Corrino, whose power is secured by his control of the brutally efficient military force known as the Imperial Sardaukar.