When the Sasanian Empire fell, Yazdegerd III ordered Adhar Valash to cede the dominion to spahbed Gil Gavbara in 645 CE, while western and Southern Gilan and other parts of Gil's domain merged under the name of Tapuria.
After the Sasanian disaster, Yazdegerd fled to Isfahan and then Estakhr where he tried to organize a base for resistance in the province of Pars.
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Following this colossal defeat, the last Sassanid Emperor, Yazdegerd III, became a hunted fugitive and fled eastward deep into Central Asia.