The 870s decade ran from January 1, 870, to December 31, 879.
The 910s decade ran from January 1, 910, to December 31, 919.
Year 870 (DCCCLXX) was a common year starting on Sunday of the Julian calendar, the 870th year of the Common Era (CE) and Anno Domini (AD) designations, the 870th year of the 1st millennium, the 70th year of the 9th century, and the 1st year of the 870s decade.
Boris I, venerated as Saint Boris I (Mihail) the Baptizer, was the ruler (knyaz) of the First Bulgarian Empire from 852 to 889. Despite a number of military setbacks, the reign of Boris I was marked with significant events that shaped Bulgarian and European history. With the Christianization of Bulgaria in 864, paganism was abolished. A skillful diplomat, Boris I successfully exploited the conflict between the Patriarchate of Constantinople and the Papacy to secure an autocephalous Bulgarian Church, thus dealing with the nobility's concerns about Byzantine interference in Bulgaria's internal affairs.
Tsar SimeonI the Great ruled over Bulgaria from 893 to 927, during the First Bulgarian Empire. Simeon's successful campaigns against the Byzantines, Magyars and Serbs led Bulgaria to its greatest territorial expansion ever, making it the most powerful state in contemporary Eastern and Southeast Europe. His reign was also a period of unmatched cultural prosperity and enlightenment later deemed the Golden Age of Bulgarian culture.
Vladimir-Rasate was the ruler of the First Bulgarian Empire from 889 to 893.
The Battle of Achelous or Acheloos, also known as the Battle of Anchialus, took place on 20 August 917, on the Achelous river near the Bulgarian Black Sea coast, close to the fortress Tuthom between Bulgarian and Byzantine forces. The Bulgarians obtained a decisive victory which not only secured the previous successes of Simeon I, but made him de facto ruler of the whole Balkan Peninsula, excluding the well-protected Byzantine capital Constantinople and the Peloponnese. The battle, which was one of the biggest and bloodiest battles of the European Middle Ages, was one of the worst disasters ever to befall a Byzantine army, and conversely one of the greatest military successes of Bulgaria. Among the most significant consequences was the official recognition of the imperial title of the Bulgarian monarchs, and the consequent affirmation of Bulgarian equality vis-à-vis Byzantium.
Orso II Participazio was the eighteenth doge of the Republic of Venice, by tradition, from 912 to 932.
The House of Vlastimirović was the first Serbian royal dynasty, named after Prince Vlastimir, who was recognized by the Byzantine Empire. The dynasty was established with the Unknown Archon, who ruled during the reign of Emperor Heraclius (610–641). The Vlastimirović dynasty ruled in Serbia until the 940s/960s, when some of the Serbian lands were annexed by the Byzantine Empire.
Petar Gojniković or Peter of Serbia was Prince of the Serbs from 892 to 917. He ruled and expanded the First Serbian Principality and won several wars against other family members that sought the crown. He was the first Serbian monarch with a Christian (non-Slavic) name.
The Byzantine–Bulgarian wars were a series of conflicts fought between the Byzantine Empire and Bulgaria which began after the Bulgars conquered parts of the Balkan peninsula after 680 AD. The Byzantine and First Bulgarian Empire continued to clash over the next century with variable success, until the Bulgarians, led by Krum, inflicted a series of crushing defeats on the Byzantines. After Krum died in 814, his son Omurtag negotiated a thirty-year peace treaty. Simeon I had multiple successful campaigns against the Byzantines during his rule from 893 to 927. His son Peter I negotiated another long-lasting peace treaty. His rule was followed by a period of decline of the Bulgarian state.
The Battle of Boulgarophygon was fought in the summer of 896 near the town of Boulgarophygon between the Byzantine Empire and the First Bulgarian Empire. The result was an annihilation of the Byzantine army which determined the Bulgarian victory in the trade war of 894–896.
Marmais was a Bulgarian military commander, nobleman and komita (duke) of a western Bulgarian region during the reign of Emperor Simeon I (893–927). He was a descendant of an ancient Bulgar family. He participated actively in the Byzantine–Bulgarian war of 913–927 but he is better known for his interference and campaigns against the Principality of Serbia.
The battle of Katasyrtai (Kατασυρται) occurred in the fall of 917, shortly after the striking Bulgarian triumph at Achelous near the village of the same name close to the Byzantine capital Constantinople,. The result was a Bulgarian victory.
The Battle of Pegae was fought between 11 and 18 March 921 in the outskirts of Constantinople between the forces of the Bulgarian Empire and the Byzantine Empire during the Byzantine–Bulgarian war of 913–927. The battle took place in a locality called Pegae, named after the nearby Church of St. Mary of the Spring. The Byzantine lines collapsed at the very first Bulgarian attack and their commanders fled the battlefield. In the subsequent rout most Byzantine soldiers were killed by the sword, drowned or were captured.
The Bulgarian-Serbian wars were a series of conflicts between the Bulgarian Empire and medieval Serbian states between the 9th and 14th centuries in the central Balkans.
This is a list of people, places, and events related to the medieval Bulgarian Empires — the First Bulgarian Empire (681–1018), and the Second Bulgarian Empire (1185–1396).
The Byzantine–Bulgarian war of 894–896 was fought between the Bulgarian Empire and the Byzantine Empire as a result of the decision of the Byzantine emperor Leo VI to move the Bulgarian market from Constantinople to Thessalonica which would greatly increase the expenses of the Bulgarian merchants.
The Bulgarian–Serbian wars of 917–924 were a series of conflicts fought between the Bulgarian Empire and the Principality of Serbia as a part of the greater Byzantine–Bulgarian war of 913–927. After the Byzantine army was annihilated by the Bulgarians in the battle of Achelous, the Byzantine diplomacy incited the Principality of Serbia to attack Bulgaria from the west. The Bulgarians dealt with that threat and replaced the Serbian prince with a protégé of their own. In the following years the two empires competed for control over Serbia. In 924 the Serbs rose again, ambushed and defeated a small Bulgarian army. That turn of events provoked a major retaliatory campaign that ended with the annexation of Serbia in the end of the same year.
The Byzantine–Bulgarian war of 913–927 was fought between the Bulgarian Empire and the Byzantine Empire for more than a decade. Although the war was provoked by the Byzantine emperor Alexander's decision to discontinue paying an annual tribute to Bulgaria, the military and ideological initiative was held by Simeon I of Bulgaria, who demanded to be recognized as Tsar and made it clear that he aimed to conquer not only Constantinople but the rest of the Byzantine Empire, as well.
