John of Gothia
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John of Gothia was Greek Orthodox Bishop of Gothia and Metropolitan of Doros, a stronghold of the Crimean Goths, in the mid to late 700s CE.
In 787 John led a revolt against Khazar domination of Gothia. The Khazar garrison and tudun were expelled from Doros, but returned and retook the city in less than a year. John was imprisoned in Itil for a time before being released.
Vasiliev, Aleksandr A. The Goths in the Crimea. Cambridge, MA: The Mediaeval Academy of America, 1936.