</s> ▁Abd ul lah ▁al - A ft ah ▁ibn ▁Ja ' far ▁al - S adi q ▁( d . ▁ 7 6 6 ▁CE ▁/ ▁ 1 4 9 ▁A . H .) ▁was ▁the ▁el dest ▁surv iving ▁son ▁of ▁Ja ' far ▁al - S adi q ▁( after ▁al - S adi q ’ s ▁death ) ▁and ▁the ▁full - bro ther ▁of ▁Is ma ' il ▁ibn ▁J af ar . ▁Abd ul lah ’ s ▁title ▁" al - A ft ah " ▁der ives ▁from ▁the ▁Arab ic ▁words ▁" aft ah ▁al - ra ’ s " ▁( bro ad - head ed ) ▁or ▁" aft ah ▁al - rij lay n " ▁( bro ad - fo oted ) ▁used ▁to ▁describe ▁his ▁appearance . ▁ ▁Life ▁During ▁the ▁lifetime ▁of ▁his ▁father , ▁Abd ul lah ▁al - A ft ah ▁had ▁supported ▁the ▁revol t ▁of ▁his ▁relative ▁Muhammad ▁ibn ▁Ab dal lah ▁An - N af s ▁Az - Z aki y ya . ▁ ▁Following ▁Ja ' far ▁al - S adi q ’ s ▁death , ▁the ▁majority ▁of ▁Ja ' far ’ s ▁follow ers ▁accepted ▁Abd ul lah ▁al - A ft ah ▁as ▁their ▁new ▁Im am . ▁These ▁follow ers ▁were ▁known ▁as ▁the ▁F ath ites ▁and , ▁according ▁to ▁the ▁Mu ' t az ili ▁her esi ograph er ▁Ab ul - Q as im ▁al - B alk hi