1/2 Drachm - `Umar ibn al-`Ala Abbasid Governors of Tabaristan - Arab-Sasanian

ʿUmar ibn al-ʿAlaʾ governed Tabaristan for the Abbasids during a period when the region had only recently been brought under sustained caliphal control — the mountainous terrain south of the Caspian had allowed local Zoroastrian dynasties to resist Arab conquest for over a century after the fall of the Sasanian empire. The half-drachm format itself is a concession to local monetary tradition, continuing Sasanian weight conventions long after Arab armies had nominally taken the province.

Album 57 is among the scarcer Tabaristan gubernatorial fractions, with ʿUmar's issues surviving in notably lower numbers than those of his better-documented predecessors.