Rubuta ci gaba don wannan sakin layi - Harthama ibn A'yan (; ya mutu a watan Yuni 816) wani janar ne da aka haife shi a Khurasan kuma gwamna ne na farkon Khalifancin Abbasid, yana aiki a ƙarƙashin kalifa al-Hadi, Harun al-Rashid da al-Ma'mun. Ya taka muhimmiyar rawa a nasarar al-Ma'mun a yakin basasar Abbasid
, amma an kashe shi a kan umarninsa lokacin da ya yi zanga-zangar adawa da ikon dangin Sahlid wanda ya mamaye kotun sa.