Третий Рим
Metropolitan Jonas, like his predecessors, was given the title of Metropolitan of Kiev and All Rus', but his successors styled themselves as Metropolitans of Moscow and All Rus'. Five years later, Constantinople fell to the Ottoman Turks. Afterwards, the Russian Church and the Duchy of Moscow (later the Russian Tsardom) saw Moscow as the Third Rome, legitimate successor to Constantinople, and the metropolitan of Moscow as head of the Russian Church.