famine, so that even a horse's head could not be bought for less than a half-grivna. While Sviatoslav's campaign brought no tangible results for the Rus', it weakened the Bulgarian state and left it vulnerable to the attacks of Basil the Bulgar-Slayer four decades later. Death and aftermath Fearing that the peace with Sviatoslav would not endure, the Byzantine emperor induced the Pecheneg khan Kurya to kill Sviatoslav before he reached Kiev. This was in line with the policy outlined by Constantine VII Porphyrogenitus in De Administrando Imperio of fomenting strife between the Rus' and the Pechenegs. According to the Slavic chronicle, Sveneld attempted to warn Sviatoslav to avoid the Dnieper rapids, but the prince slighted his wise advice and was ambushed and slain by the Pechenegs when he tried to cross the cataracts near Khortytsia early in 972. The Primary Chronicle reports that his skull was made into a chalice by the Pecheneg khan. Following Sviatoslav's death, tensions among his sons grew. A war broke out between his legitimate sons, Oleg and Yaropolk, in 976, at the conclusion of which Oleg was killed. In 977 Vladimir fled Novgorod to escape Oleg's fate and went to Scandinavia, where he raised an army of Varangians and returned in 980. Yaropolk was killed, and Vladimir became the sole ruler of Kievan Rus'. Art and literature Sviatoslav has long been a hero of Belarusian, Russian, and Ukrainian patriots due to his great military successes. His figure first attracted attention of Russian artists and poets during the Russo-Turkish War (1768–1774), which provided obvious parallels with Sviatoslav's push towards Constantinople. Russia's southward expansion and the imperialistic ventures of Catherine II in the Balkans seemed to have been legitimized by Sviatoslav's campaigns eight centuries earlier. Among the works created during the war was Yakov Knyazhnin's tragedy Olga (1772). The Russian playwright chose to introduce Sviatoslav as his protagonist, although his active participation in the events following Igor's death is out of sync with the traditional chronology. Knyazhnin's rival Nikolai Nikolev (1758–1815) also wrote a play on the subject of Sviatoslav's life. Ivan Akimov's painting Sviatoslav's Return from the Danube to Kiev (1773) explores the conflict between military honour and family attachment. It is a vivid example of Poussinesque rendering of early medieval subject matter. Interest in Sviatoslav's career increased in the 19th century. Klavdiy Lebedev depicted an episode of Sviatoslav's meeting with Emperor John in his