Historians relate that when Mango Khan, the son of Tooli Khan, the son of Chungeez Khan, ascended the throne of Karakorum and Kulooran, the Aligh Yurut of Chungeez; he despatched Taicho Noyaun with a great force to take possession of Persia. After Taicho had conquered that country, he received certain complaints against the Caliph Mostasum Bíllah, and the infidel tribe of the Ismaelites,* which he forwarded to Mango Khan, who despatched against them his brother Hulako Khan, and the fifth part of the army of Chungeez Khan residing at Aligh Yurut.