influenced era notability works article_title name
bukhari and ahmad ibn hanbal islamic golden age muslim scholar '' '' -lrb- history -rrb- tabaqat '' -lrb- biographies -rrb- and '' tarikh khalifa ibn khayyat
 '' ` khalifa ibn khayyat '' '
khalifa ibn khayyat

abū ` amr khalifa ibn khayyat al laythī al ` usfurī -lrb- born : 160/161 a.h / 777 a.d -- died 239/240 a.h / 854 a.d -rrb- was an arab historian .
his family were natives of basra in iraq .
his grandfather was a noted muhaddith or traditionalist , and khalifa became renowned for this also .
among the great islamic scholars who were his pupils were bukhari and ahmad ibn hanbal .
he is known to have written at least four works , of which two have survived .
these are the `` tabaqat '' -lrb- biographies -rrb- and `` tarikh '' -lrb- history -rrb- .
the latter is valuable as being one of three of the earliest arabic histories , but the full text was not known until an 11th-century copy was found in rabat , morocco in 1966 -lrb- published in 1967 -rrb- .
