Harun al-Rashid

Harun was born around 763 to Caliph al-Mahdi and his Yemeni former-slave wife al-Khayzuran, who preferred her younger son. As crown prince he led campaigns against the Byzantines in 780 and 782, reaching the suburbs of Constantinople, earning the title al-Rashid, "the rightly guided." His older brother al-Hadi reigned barely a year before dying in 786. Harun became caliph at twenty-two.

On his first day he made Yahya the Barmakid, his Persian tutor, vizier; for seventeen years Yahya and his sons ran the empire while Harun campaigned and patronised the arts. In 796 he moved his court from Baghdad to Raqqa, closer to the Byzantine frontier. When Nikephoros I withheld tribute in 802, Harun wrote on his letter, "From the Commander of the Faithful to Nikephoros, dog of the Romans — you will not hear, you will see my reply," and crushed the Byzantines.

Culture was his greatest legacy. The House of Wisdom — Bayt al-Hikma — translated Greek, Persian and Indian classics into Arabic. Aristotle, Galen and Ptolemy were rendered there, and via al-Andalus seeded the European Renaissance. In 799 he exchanged embassies with Charlemagne, sending an elephant, a water clock and silks. The legendary Harun of One Thousand and One Nights cemented his popular fame.

In 803 he abruptly destroyed them: Yahya and Fadl imprisoned, Ja'far executed, estates seized. Sources cite different triggers — overweening power, Ja'far's unauthorised child with his sister Abbasa, or unbidden entry to the imperial presence. The purge ended seventeen years of competent rule and shifted power to military men, sketching the future Mamluk system.

Outward triumphs concealed decay: the Umayyads had ruled Spain since 755, the Idrisids Morocco from 788, the Aghlabids Tunisia from 800. Harun died in March 809 at forty-five. His division of the empire between al-Amin and al-Ma'mun ignited civil war within two years — embodying in one career both the apex of Islamic civilisation and the seed of its fragmentation.