the existence of any descendant of hasan al askari is disputed by many people. genealogy trees of middle eastern and central asian families, mostly from persia, khorasan, samarqand and bukhara, show that hasan al-askari had also a second son called sayyid ali akbar. it definitely indicates that al-askari had children and it also substantiates the existence of muhammad al mahdi. whether al askari had children or not is still disputed may be because of the political conflicts between the followers of the imamah and the leadership of the abbasids and ghulat shiites who do not believe in hasan al-askaris imamah. another group of historians studying the pedigrees of some central asian saints' "shejere" (genealogy trees), believe that the twelfth imam was not the only son of hasan al-askari, and that the eleventh imam had two sons, sayyid muhammad (i.e., the shia mahdi) and sayyid ali akbar. one descendant of sayyid ali akbar was saint ishan (eshon) imlo of bukhara. ishan imlo is called "saint of the last time" in bukhara, as it is believed that after him there were no more saintsasian muslims generally revere him as the last of the saints. according to the source, ishan imlo died in 1162ah (1748–1749); his mausoleum (mazar) is in a cemetery in bukhara. notable descendants of sayyid ali akbar are sufi saints like bahauddin naqshband, descendant after eleven generations, khwaja khawand mahmud known as hazrat ishaan, descendant after eighteen generations, the two brothers sayyid ul sadaat sayyid mir jan and sayyid ul sadaat mir sayyid mahmud agha, maternal descendants of hasan al askari. and also qadi qozi sayyid bahodirxon., sufi saints tajuddin muhammad badruddin and pir baba.