Sviatoslav's invasion of Bulgaria
{'<entity_0>': "Sviatoslav's invasion of Bulgaria", '<entity_1>': 'First Bulgarian Empire', '<entity_2>': 'Byzantine Empire', '<entity_3>': "Kievan Rus'", '<entity_4>': 'Pechenegs', '<entity_5>': 'invasion', '<entity_6>': 'Hungarians', '<entity_7>': 'Thrace', '<entity_8>': '967', '<entity_9>': '971', '<entity_10>': 'war'}
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<entity_0> refers to a conflict beginning in <entity_8>/968 and ending in <entity_9>, carried out in the eastern Balkans, and involving the <entity_3>, <entity_1>, and the <entity_2>. The Rus' withdrew and eastern <entity_1> was incorporated into the <entity_2>. By 965/966, the warlike new Byzantine emperor Nikephoros II Phokas refused to renew the annual tribute that was part of the peace agreement and declared <entity_10> on <entity_1>. Preoccupied with his campaigns in the East, Nikephoros resolved to fight the <entity_10> by proxy and invited the Rus' ruler Sviatoslav to invade <entity_1>. After stopping a Rus' advance through <entity_7> at the Battle of Arcadiopolis in 970, the Byzantine emperor John I Tzimiskes led an army north into <entity_1> in <entity_9> and captured Preslav, the capital. Tzimiskes formally annexed Eastern <entity_1> to the <entity_2>. By the beginning of the 10th century, two powers had come to dominate the Balkans: the <entity_2> controlled the south of the peninsula and the coasts, and the <entity_1> held the central and northern Balkans. <entity_1>, despite the barrier formed by the Danube, was still menaced in its northern reaches by steppe peoples, the <entity_6> and the <entity_4>. Their Crimean outpost of Cherson maintained trade with the <entity_4> and the emerging power of the <entity_3>; Byzantine missionaries led the Christianization of the <entity_6>; and the Slavic princes of the western Balkans came to once again acknowledge the suzerainty of the Empire, particularly after Caslav Klonimirovic ended Bulgarian control over Serbia. These relationships on the periphery of the <entity_1> were an important asset for Byzantine diplomacy: instigating attacks against <entity_1> by the <entity_4> and the Khazars was a time-honoured method of applying pressure on the Bulgarians. Nikephoros' decision to effect a breach of relations with <entity_1> was also in response to the recent treaty that Peter I had signed with the <entity_6>. The treaty stipulated that the <entity_6> would be allowed to pass through the country and raid Byzantium in exchange for halting their raids in <entity_1>. In early 970, a Rus' army, with large contingents of Bulgarians, <entity_4>, and <entity_6>, crossed the Balkan Mountains and headed south. After being occupied with suppressing the revolt of Bardas Phokas throughout the year 970, Tzimiskes marshalled his forces in early <entity_9> for a campaign against the Rus', moving his troops from Asia to <entity_7> and gathering supplies and siege equipment. ^ a: The chronology of the Byzantine embassy to Kiev and Sviatoslav's <entity_5> and conquest of <entity_1> is uncertain, since the sources disagree with each other.
['invasion', 'war']