Mezue ahịrịokwu na-esonụ: N'aka nke ọzọ, ọkọ akụkọ ihe mere eme M. A. Shaban na-ewere mkpọsa ahụ dị ka "ihe ịga nke ọma" kachasị mma, ma na-akatọ nlebara anya "otu uche" nke Harun na ndị Byzantines dị ka "mgbalị na-ezighi ezi". Dabere na Shaban, ọ bụghị naanị na ndị Byzantium enweghị ezigbo ikike (ma ọ bụ ebumnuche) iji yie Caliphate egwu, mana mkpọsa mbanye nke Harun dugara na mbata nke ndị agha ọwụwa anyanwụ sitere na Khurasan, nke megidere ndị isi agha ọdịnala Syria-Iraqi ma mepụta ọgba aghara nke nyere aka na
Fitna nke anọ, agha obodo Abbasid nke dara mgbe Harun nwụsịrị. Esemokwu a, n'etiti ụmụ Harun al-Amin () na al-Ma'mun (), pụtara na Abbasid Caliphate enweghị ike iji uru nke Byzantine tụgharịa na Balkans. N'ezie, mkpọsa nke 806 na mwakpo ndị na-adịghị arụ ọrụ nke 807 na-egosi nnukwu njem ikpeazụ, nke a haziri ahazi, nke ndị Abbasid megide Byzantium ruo ihe karịrị afọ iri abụọ. Mgbasa na mwakpo ndị ọzọ nọgidere na ala nakwa n'oké osimiri, na, n'enweghị ndị Abbasids, ndị isi Alakụba obodo meriri Crete ma malite mmeri nke Sicily na 820s. Agbanyeghị, nnukwu ọrụ na oke ala dị n'akụkụ ọwụwa anyanwụ nke Asia Minor n'etiti alaeze abụọ ahụ maliteghachiri naanị mgbe ọbịbịa nke Emperor Theophilos (), onye agha ya na ndị caliphs al-Ma'mun na al-Mu'tasim () ruru na nnukwu mbuso agha nke al-Ma'mun na 830-833, na Sack nke Amorium site al-Mu'tasim na 838.