amir al-umara
... that with the appointment of Muhammad ibn Ra'iq in 936, the holder of the office of amir al-umara became the virtual regent of the Abbasid Caliphate?
... that with the appointment of <a href="./Muhammad_ibn_Ra'iq" id="mwAj4" rel="mw:WikiLink" title="Muhammad ibn Ra'iq">Muhammad ibn Ra'iq</a> in 936, the holder of the office of <i id="mwAj8"><b id="mwAkA"><a href="./Amir_al-umara" id="mwAkE" rel="mw:WikiLink" title="Amir al-umara">amir al-umara</a></b></i> became the virtual regent of the <a href="./Abbasid_Caliphate" id="mwAkI" rel="mw:WikiLink" title="Abbasid Caliphate">Abbasid Caliphate</a>?