In the name of God, the Compassionate, the Merciful. From the Commander of the Faithful Harun al-Rashid to Nikephoros, dog of the Romans. You will not hear my reply — you will see it.
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ ، مِنْ أَمِيرِ الْمُؤْمِنِينَ هَارُونَ الرَّشِيدِ إِلَى نِقْفُورَ كَلْبِ الرُّومِ
Politicians
Harun al-Rashid
Fifth Abbasid caliph (763-809). Founded Baghdad's House of Wisdom, traded ambassadors with Charlemagne, became the hero of One Thousand and One Nights — but his 803 Barmakid purge began the caliphate's disintegration.
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Source: アル=タバリー『預言者と諸王の歴史』(タバリー年代記)、802年のニケフォロス1世への返書Verified