seehagiasophia:The embassy of John the Grammarian in 829, between the Abbasid Caliph Al-Ma'mun (left
seehagiasophia:The embassy of John the Grammarian in 829, between the Abbasid Caliph Al-Ma'mun (left) and the Byzantine emperor Theophilos (right), from the Madrid Skylitzes (12th-13th century). -- source link
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