Political legitimacy in Kievan Rus' resided in the dynasty. The ruling family managed to create an ideological framework for its own pre-eminence which was maintained without serious challenge for over half a millennium. To this extent the political structure was simple: the lands of the Rus' were, more or less by definition, the lands claimed or controlled by the descendants of Vladimir Sviatoslavich. Like Vladimir, Iaroslav allocated regional possessions to his sons. Unlike Vladimir, he specified a hierarchy of seniority both within the dynasty and between the regional allocations, and he laid down some principles of inter-princely relations. The princes of Rus' were warlords, heading a military elite. Since prince of Kiev, Vladimir Vsevolodovich Monomakh wrote an 'Instruction' for his sons, a kind of brief curriculum vitae presenting as exemplary his own credentials and achievements. In the three generations after Vladimir the main implications of the official conversion to Christianity were made manifest.