In the fictional universe of The Foundation Series, Cleon I (11,988 GE - 12,038 GE) was the last Galactic Emperor of the Entun dynasty. He was Emperor of the Galactic Empire when Hari Seldon first arrived on Trantor. He succeeded to the Imperial throne in 12,010 GE at the age of twenty-two following the death of his father, Stanel VI, who was fortunate enough to escape the roughly one-in-two chances of assassination faced by the last century of Galactic Emperors.