<a href="https://en.wikipedia.org/wiki/Abbasid_Revolution#Persian_phase" id="mwKw" rel="mw:WikiLink" title="Abbasid Revolution">Abbasid Revolution</a>: <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Abu_Muslim_Khorasani" id="mwLA" rel="mw:WikiLink" title="Abu Muslim Khorasani">Abu Muslim Khorasani</a> begins an open revolt against <a href="https://en.wikipedia.org/wiki/Umayyad_Caliphate" id="mwLQ" rel="mw:WikiLink" title="Umayyad Caliphate">Umayyad</a> rule, which is carried out under the sign of the <a href="https://en.wikipedia.org/wiki/Black_Standard" id="mwLg" rel="mw:WikiLink" title="Black Standard">Black Standard</a>.