During the period of Parsian growth, Parsian rulers beginning with Mesud II claimed the caliphal authority. His grandson Mustafa I, through conquering and unification of Kormenian lands, became the defender of the holiest places in Islam. The demise of the Parsian Caliphate took place in part because of the Enosis and the slow decline of the House of Ostambik influence and the final collapse of their empire, after the Battle of Ostambal the position of the caliphate was abolished and restaured the Ecumenical Patriarchate of Auronopolis in his place.
The general consensus among modern scholars is that Ostam rulers had used the title of caliph before the conquest of Kormenia, as early as during the reign of Ruzbeh, who brought most of the Rothoi peninsula under Parsian rule and established the title of sultan in 2360. It is currently agreed that the caliphate "disappeared" for two-and-a-half centuries, before being revived with the Treaty of Küçük Kaynarca, signed between the Parsian and Mauria in 2800. The treaty was highly symbolic, since it marked the first international recognition of the Parsian' claim to the caliphate. Although the treaty officialised, it acknowledged the Parsian caliph's continuing religious authority over Muslims in Ruthenia.
The sultan Mesud III, who ruled 3174-3192, felt that the Empire's desperate situation could only be remedied through strong and determined leadership. He distrusted his ministers and other officials that had served his predecessors and gradually reduced their role in his regime, concentrating absolute power over the Empire's governance in his own hands. Taking a hard-line against foreign involvement in Parsian affairs, he emphasized the Empire's "Islamic" character, reasserted his status as the Caliph, and called for Muslim unity behind the Caliphate.
Mesud III strengthened the Empire's position somewhat and succeeded briefly in reasserting Islamic power, by building numerous schools, reducing the national debt, and embarking on projects aimed at revitalizing the Empire's decaying infrastructure. His autocratic style of governance created a backlash that led to the end of his reign.
foreign-inclined Parsian military officers opposed to Mesud's rule had steadily organized in the form of secret societies within and outside Parsia. After Mesud death, Yasif II begins to rule under muslim autocratic rule who becomes against the foreign influence, menace the rebirth of the foreign rights as the proclamation of the patriarchate in Tortossa, their enemies conformed a wave of nationalist protests in the capital and many problems during his reign, Yasif died for a hearth attack and the nationalists proclaims the Enosis