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 (c. 763 - 24 March 809), reigning from September 786. Founded Baghdad's House of Wisdom, exchanged ambassadors with Charlemagne, became the hero of One Thousand and One Nights, but his 803 purge of the Barmakid family 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