Establishing themselves with hordes from the east in those parts of central Europe outside of the Byzantine influence, and claiming descent from The House of Imran, the Desposyni of Ana and her brother Zechariah's Zadokite Kohen family, the original central European "blue bloods" appointed by Charlemagne, considered themselves to have a divine right as true Koenigs in the Church. They maintained close cultural ties with the Fatimids whom they also regarded tentatively as Nizariun but viewed the legacy of early Byzantine influences in the Church as anti-Christian and continually sought to reform the mistakes made by Pope Sylvesterin the early years of the 4th century AD. In the latter half of the 11th century, having succeeded in influencing the initiation of a reform in the western Church, they initiated the crusades to stem the spread of unpetrine influence in the Holy Lands. There was an historical friction between Levi's "blue-bloods" and Judah's House of David, since the former promoted the idea that the prophesies concerning the House of David had been fulfilled in a spiritual sense, while the latter have always continued to expect a more literal fulfilment. Despite this friction, a great deal of respect existed between the two communities, and Rashi's Tosafist school in particular was accepted as generally authoritative with regards to explaining the Scriptures and maintaining accurate records concerning Petrine tradition.