It has already been related that the Ismailian sect of the Muhammedans had introduced the doctrine of a coming Messiah, or Mahdi, who was to be the last of the imans, and the incarnation of the universal soul.
"History Of Egypt From 330 B.C. To The Present Time, Volume 12 (of 12)"
S. Rappoport
Some accounts trace the descent of Obaid from Abd Allah ibn Maimun el-Kaddah, the founder of the Ismailian sect, of which the Carmathians were a branch.
"History Of Egypt From 330 B.C. To The Present Time, Volume 11 (of 12)"
S. Rappoport