Example image of eyePlorer eyePlorer map for '820': Caliphate Greater Khorasan Tahir Baghdad Michael II Historia Brittonum Feidlimid mac Cremthanin Munster Algebra Muhammad ibn Mūsā al-Khwārizmī Muslim 775 778 788 878 891 Adi Shankara Assassination December 24 Ecumenical Patriarch of Constantinople Emperor of China Emperor Xianzong of Tang Kingdom of Gwynedd Leo V the Armenian List of Byzantine emperors Photios I of Constantinople Rhodri the Great Wales Anandavardhana Arzen Huangfu Bo January 5 (Eastern Orthodox liturgics) July 28 (Eastern Orthodox liturgics) Li Yong (chancellor) List of state leaders in 782 List of state leaders in 783 List of state leaders in 784 List of state leaders in 785 List of state leaders in 786 List of state leaders in 787 List of state leaders in 788 List of state leaders in 789 List of state leaders in 790 List of state leaders in 791 List of state leaders in 792 List of state leaders in 793 List of state leaders in 794 List of state leaders in 795 List of state leaders in 796 List of state leaders in 797
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