Tarikh (al-Tabari) 4972
Then the year 440 began
وَفِيهَا خُطِبَ لِلْأَمِيرِ أَبِي الْعَبَّاسِ مُحَمَّدِ بْنِ الْقَائِمِ بِأَمْرِ اللَّهِ بِوِلَايَةِ الْعَهْدِ ، وَلُقِّبَ ذَخِيرَةَ الدِّينِ وَوَلِيَّ عَهْدِ الْمُسْلِمِينَ.
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