Bulgarian alliance with the Magyars, and he undertook a show of force at the Bulgarian border. Dissuaded from a direct attack against Bulgaria, Nikephoros II dispatched a messenger to the Rus prince Sviatoslav Igorevich to arrange a Rus attack against Bulgaria from the north. Sviatoslav readily launched a campaign with a vast force of 60,000 troops, routed the Bulgarians on the Danube, and defeated them in a battle near Silistra, seizing some 80 Bulgarian fortresses in 968. Stunned by the success of his ally and suspicious of his actual intentions, Emperor Nikephoros II hastened to make peace with Bulgaria and arranged the marriage of his wards, the underage emperors Basil II and Constantine VIII, to two Bulgarian princesses. Two of Peter's sons were sent to Constantinople as both negotiators and honorary hostages. In the meantime Peter managed to secure the retreat of the Rus forces by inciting Bulgaria's traditional allies, the Pechenegs, to attack Kiev itself. In spite of this temporary success and the reconciliation with Byzantium, Bulgaria faced a new invasion by Sviatoslav in 969. The Bulgarians were defeated again, and Peter suffered a stroke, which led him to abdicate and become a monk. He died on 30 January 969. Reputation Compared with the military success of his father's reign, Peter has been traditionally considered a weak ruler, who lost lands and prestige, allowed his military forces to decline while his country was ravaged by foreign invaders, and turned Bulgaria into a Byzantine satellite governed by Byzantine agents in the persons of his empress and her retinue. This view has been questioned by more recent scholarship, which emphasizes the affluence and internal peace enjoyed by Bulgarian society during his long reign, re-evaluates the relationship between Bulgaria and its semi-nomadic neighbors (Magyars and Pechenegs), and questions the allegedly sinister role of Romanos' granddaughter and her retinue. While Peter's reign witnessed the spread of the Bogomil heresy, its origins were more demographic (perhaps inspired by Paulicians settled earlier by Byzantine emperors in Thrace) than social, and the Bulgarian Orthodox Church canonized him as a saint. Peter was considered a good ruler in the Middle Ages, and when Bulgaria fell under Byzantine rule (1018–1185), leaders of attempts to restore Bulgarian independence adopted his name to emphasize legitimacy and continuity (both Peter Delyan and Constantine Bodin adopted the royal name of Peter in their attempts to regain the throne from the Byzantines). Family