During his long rule, Petar strengthened the state by uniting the often quarreling tribes, consolidating his control over Montenegrin lands, and introducing the first laws in Montenegro.
Oma pika valitsemise ajal tugevdas Petar riiki, ühendades sageli tülitsevad hõimud, tihendades oma kontrolli Montenegro maade üle ja algatades esimesed Montenegro seadused.