Note 185
The kings of Persia in the last century are descended from Sheik Sefi, a saint of the xivth century, and through him, from Moussa Cassem, the son of Hosein, the son of Ali, (Olearius, p. 957. Chardin, tom. iii. p. 288.) But I cannot trace the intermediate degrees in any genuine or fabulous pedigree. If they were truly Fatimites, they might draw their origin from the princes of Mazanderan, who reigned in the ixth century, (D'Herbelot, p. 96.)]
The History Of The Decline And Fall Of The Roman Empire Fall In The EastChapter 50