Harun al-Rashid

Abu Ja'far Harun ibn Muhammad al-Mahdi (Arabic: أَبُو جَعْفَر هَارُون ٱبْنِ مُحَمَّد ٱلْمَهْدِيّ, romanized: Abū Ja'far Hārūn ibn Muḥammad al-Mahdī) or simply Harun ibn al-Mahdi (Arabic: هَارُون ٱبْنِ ٱلْمَهْدِيّ; c. 763 or 766 – 24 March 809), famously known as Harun al-Rashid (Arabic: هَارُون ٱلرَّشِيد, romanized: Hārūn ar-Rashīd), was the fifth Abbasid caliph of the Abbasid Caliphate, reigning from September 786 until his death in March 809. His reign is traditionally regarded to be the beginning of the Islamic Golden Age. His epithet al-Rashid translates to "the Orthodox", "the Just", "the Upright", or "the Rightly-Guided".

Harun established the legendary library Bayt al-Hikma ("House of Wisdom") in Baghdad in present-day Iraq, and during his rule Baghdad began to flourish as a world center of knowledge, culture and trade. During his rule, the family of Barmakids, which played a deciding role in establishing the Abbasid Caliphate, declined gradually. In 796, he moved his court and government to Raqqa in present-day Syria. Domestically, Harun pursued policies similar to those of his father Al-Mahdi. He released many of the Umayyads and 'Alids his brother Al-Hadi had imprisoned and declared amnesty for all political groups of the Quraysh. Large scale hostilities broke out with Byzantium, and under his rule, the Abbasid Empire reached its peak.

A Frankish mission came to offer Harun friendship in 799. Harun sent various presents with the emissaries on their return to Charlemagne's court, including a clock that Charlemagne and his retinue deemed to be a conjuration because of the sounds it emanated and the tricks it displayed every time an hour ticked. Portions of the fictional One Thousand and One Nights are set in Harun's court and some of its stories involve Harun himself. Harun's life and court have been the subject of many other tales, both factual and fictitious.