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After reigning twenty years, he was succeeded by his licentious son, Dhafir, whose faults led to his death at the hand of his vizier, El-Abbas. For the ensuing six years the supreme power in Egypt was mainly the bone of contention between rival viziers, although El-Faiz, a boy of five, was nominally elected caliph on the death of Dhafir.
El-Abbas was worsted by his rival, Tataë, and fled to Syria with a large sum of money; but he fell into the hands of the Crusaders, was returned to Tataë, and crucified. The last of the Fatimite caliphs, El-Adid, in 555 a.h., was raised to the throne by Tataë, but his power was merely the shadow of sovereignty.
The great African physician's best known work, the so-called "Liber Pantegni," which is really a translation of the "Khitaab el Maleki" of Ali Ben el-Abbas, is dedicated to Desiderius. Constantine wrote a number of other books, most of them original, but it is difficult now to decide just which of those that pass under his name are genuine.
He thought himself safe from his enraged father there, but the latter quickly returned to Fostât, and the news of the ample preparations which he was hastening for the subjection of his rebel son caused El-Abbas to place himself still farther out of his reach. The neighbouring Berbers gave Ibrahim their assistance, and Abbas was defeated and retreated to Barca in 880.
Rhazes lived well on into the tenth century. His successor in prestige, though not his serious rival, was Ali Ben el-Abbas, usually spoken of in medical literature as Ali Abbas, a distinguished Arabian physician who died near the end of the tenth century. This became the leading text-book of medicine for the Arabs until replaced by the "Canon of Avicenna" some two centuries later.
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