During the Safavid period, the Shi'i Muharram commemorative rites which had been publically practiced since the 7th century, became a manifestation of state power. Already during the reign of Shah 'Abbas I (1587-1629) the Muharram rituals had transformed into an extraordinary rich repertoire of ceremonies and ceremonial spaces that can be defined as 'theater state'. Under Shah Safi I (1629-1642) these ceremonies ultimately led to carnivalesque celebrations of misrule and transgression.This first systematic study of a wide range of Persian and European archival and primary sources, analyzes how the Muharram rites changed from being an originally devotional practice to an ambiguous ritualization that in combination with other public arenas, such as the bazaar, coffeehouses or travel lodges, created distinct spaces of communication whereby the widening gap between state and society gave way to the formation of the early Iranian public sphere. Ultimately, the Muharram public spaces allowed for a shift in individual and collective identities, opening the way to multifaceted living fields of interaction, as well as being sites of contestation where innovative expressions of politics were made. In particular, the construction of the new Isfahan in 1590 is linked with the widespread proliferation of the Muharram mortuary rites by discussing rituals performed in major urban spaces.