خلع الأمين والبيعة للمأمون

In 196 AH Muhammad al-Amin was deposed, the oath was taken in Baghdad for his brother Abd Allah al-Ma'mun, and al-Amin was confined in the palace of Abu Ja'far. ¹

al-Tabari mentions that al-Amin sent armies to fight Tahir ibn al-Husayn. ²

al-Suyuti says that in 194 AH al-Amin removed his brother al-Qasim from what al-Rashid had appointed him to. al-Fadl ibn al-Rabi' urged him to depose al-Ma'mun, and al-Ma'mun cut off the post from him and dropped his name from the tiraz and the minting. al-Amin asked for the document that al-Rashid had written and placed in the Ka'ba, and it was brought and he tore it up. He gave the oath to his son Musa as heir apparent, and gave him the title "the one who speaks the truth", while he was a suckling infant. When al-Ma'mun was certain that he would be deposed, he took the title Commander of the Faithful. Khuzayma ibn Khazim advised al-Amin not to let the commanders grow bold enough to depose him, so that they would not do it, but he did not accept. ³