Battle of Ankara
Burhanettin died in 1398. But Ottoman sultan Beyazit I annexed the former Eretnid territory to his realm and began threatening the beylik of Eretna. Timur’s invasion of Anatolia at the beginning of the fifteenth century was a brief period of relief for Mutaherten who readily accepted the suzerainty of Timur. But shortly after the Battle of Ankara in 1402, victorious Timur left Anatolia. The next year Mutaherten died.