http://www.davidmus.dk/en/collections/islamic/dynasties/tulunids-and-fatimids/coins/c184?print=1
Historical note
Al-‘Aziz, who has been described as the wisest and best of the Fatimid caliphs, was tall, with red-hair and blue eyes. He was also generous, brave, fond of horses and hunting, humane and tolerant and an excellent administrator. His wife, the mother of his successor al-Hakim, was a Christian woman, and he employed both Christians and Jews in his administration, although this caused some discontent among his Muslim subjects. Under al-‘Aziz the Egyptian economy flourished, and his reign saw a period of luxury, particularly at his court, for he loved precious stones, rich materials and apparently enjoyed eating truffles.
While al-‘Aziz did not realize all his ambitions, it was during his reign that the Fatimid lands reached their greatest extent, with the khutba (the imam’s speech before Friday prayer) read in his name throughout North Africa as far as the Red Sea, in the Yemen, at Mecca in the Hijaz and in Syria.
The coinage of al-‘Aziz bore legends similar to that of al-Mu‘izz, and can be easily identified by its “bull’s eye” design, but with double (rather than triple) legends.

- отец аль-Хакима аль-Азиз был мудрейшим и лучшим из фатимидских халифов, был высоким, рыжеволосым (red-hair) и голубоглазым. Был щедрым, смелым, любил лошадей и охоту, был человечным, толерантным и прекрасным администратором. Его жена, мать Хакима (Аль-Хаким кстати тоже переводят как Мудрый), была христианкой, и он брал на службу к себе и христиан, и иудеев, чем вызывал неудовольствие его подданных-мусульман. При аль-Азизе египетская экономика процветала, при дворе была роскошь, он любил драгоценные камни, дорогие материи, а также отдавал предпочтение трюфелям. При нём владения фатимидов достигли наибольших размеров. - Т.е. при аль-Азизе был, можно сказать, золотой век, а, как пишут ФиН в "Царь славян", легенда о Золотом Веке сложилась как воспоминание о правлении Христа.
Арабское слово al-Azîz означает «благородный», «славный», «великолепный».


Википедия ошиблась видимо, написав что смерть аль-Азиза биллаха связана с лошадью:

http://en.wikipedia.org/wiki/List_of_horse_accidents
Al-Aziz Billah - sultan of Egypt, died 1198

здесь имеется в виду Аль-Азиз Усман ибн Юсуф (1171-1198), второй сын Саладина и второй аюбидский султан Египта. Он ещё хотел разрушить Великие Пирамиды Египта.


оказывается, многие древние попадали с лошадей, например:

Cambyses II, Persian king - died accidentally in 521 BC, according to Herodotus
Eadgils, semi-legendary king of Sweden, split his skull when his horse stumbled and fell.
Frederick I Barbarossa died in 1190 while crossing the Saleph River in Cilicia, south-eastern Anatolia. It is thought that he was thrown from his horse into the cold water and had a fatal heart attack as a result.
Genghis Khan - d. 1227 from injuries resulting from a fall from a horse.
Minamoto no Yoritomo, (源 頼朝, May 9, 1147—February 9, 1199)
William the Conqueror died aged 60 at the Convent of St. Gervais, near Rouen, France, on 9 September 1087 from abdominal injuries received from his saddle pommel when he fell off a horse at the Siege of Mantes.

- даже даты близки - 1190, 1198, 1199.