sentences:  This took place after the king George VIII, himself a usurper to the throne of Georgia, was captured by his defiant vassal Qvarqvare III, Duke of Samtskhe, in 1465, and dethroned in favor of Bagrat VI.He then set himself up as an independent ruler in his former princely appanage of Kakheti, the easternmost province of Georgia centered on the river valleys of Alazani and Iori, where he remained, a sort of anti-king, till his death in 1476.Overwhelmed by these difficulties, Constantine II, king of a reduced Georgia, was obliged to sanction the new order of things.