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During the early reign of Fath Ali Shah, Imperial Russia took control of Georgia, a territory which Iran had ruled intermittently since 1555 with the Peace of Amasya. Georgia, led by Erekle II, had forged an alliance with Persia's rival, Russia, following the Treaty of Georgievsk. To punish his Georgian subjects, his uncle, Agha Mohammad Khan, had invaded and sacked Tbilisi, seeking to reestablishing full Persian suzerainty over Georgia, in which he succeeded. Even though the Russian garrisons in the city had to retreat, Persia didn't manage to put back all of its needed garrisons over the country as Agha Mohammad Khan was assassinated soon afterwards in Shusha, following with Russia's act of annexation of those priorly-Iranian ruled parts of Georgia in 1801, after many Georgian embassies and a treaty.