Revolutionary dynasties toned down messianic titles once in power.

Evidence

The implication was clear; the existing regime was evil, and the rebel leader would establish a truly just society. Such claims and promises were characteristic of the propaganda of the Abbasids, the Fatimids, the Almohades and some other regimes that grew out of revolutionary movements. The first caliphs of both the Abba¯sid and Fa¯tfiimid dynasties adopted regnal titles with messianic implications, no doubt to persuade their subjects that these rulers were indeed engaged in the messianic mission of establishing the kingdom of heaven on earth. After the first few caliphs of both dynasties, the claim began to wear rather thin, and the titles adopted by later caliphs had somewhat less ambitious formulations. — Bernard Lewis, From Babel to Dragomans, 499

Categorization

• XREF: Mirrors the French and English revolutionary pattern where rhetoric cools once insurgents become the establishment — parallels ‘Political patrons can be used by radicals and then discarded.’
• SEED: An essay angle: the predictable drift from revolutionary messianism to mundane administration as regimes consolidate, in Abbasid history and modern revolutions alike.