Editing 917 (section)

== Events ==
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=== By place ===

==== Byzantine Empire ====
* [[August 20]] &ndash; [[Battle of Achelous (917)|Battle of Achelous]]: A [[Byzantine Empire|Byzantine]] expeditionary force (62,000 men) under General [[Leo Phokas the Elder|Leo Phokas]] ('''the Elder''') is routed by the [[First Bulgarian Empire|Bulgarians]] at the [[Aheloy (river)|Achelous River]] near the fortress of Anchialos (modern [[Pomorie]]) on the [[Black Sea]] coast. Phokas flees to Mesembria (modern [[Nesebar]]) and escapes by boarding a ship. Tsar [[Simeon I of Bulgaria|Simeon I]] ('''the Great''') becomes ''[[de facto]]'' ruler of the whole [[Balkans|Balkan Peninsula]], except the well-protected Byzantine capital of [[Constantinople]] and the [[Peloponnese]].<ref>Brain Todd Carey (2012). ''Road to Manzikert: Byzantine and Islamic Warfare 527–1071'', pp. 78–81. {{ISBN|978-1-84884-215-1}}.</ref>
* Fall &ndash; [[Battle of Katasyrtai]]: The Bulgarian army under Simeon I marches southwards to Constantinople. Leo Phokas, who survived at Anchelous, gathers the last Byzantine troops to intercept the Bulgarians before they reach the capital. The two armies meet near the village of Katasyrtai, just outside Constantinople. After a surprise night attack, the Byzantines are completely routed from the battlefield.<ref>{{cite book|url = https://books.google.com/books?id=AEy280AH9KQC&q=Katasyrtai&pg=PA109|title = Byzantine Empresses: Woman and Power in Byzantium AD 527-1204| author = Lynda Garland| author-link = Lynda Garland| page = 122| publisher = Routledge| date = April 1, 2002|isbn = 9780203024812}}</ref>

==== Europe ====
* [[Bulgarian–Serbian wars of 917–924#Wars|Bulgarian–Serbian War]]: Simeon I sends a Bulgarian expeditionary force under [[Theodore Sigritsa]] and [[Marmais]] to [[Principality of Serbia (early medieval)|Serbia]]. The two persuade [[Petar of Serbia|Petar Gojniković]], a Serbian prince who formed an anti-Bulgarian coalition, to meet for a peace agreement. They seize him and send the rebellious prince to the Bulgarian capital of [[Veliki Preslav|Preslav]], where he dies in prison. Simeon replaces Petar with [[Pavle of Serbia|Pavle Branović]], a grandson of prince [[Mutimir of Serbia|Mutimir]], who lives in Preslav. Serbia becomes a [[puppet state]] until 921.<ref>{{The Early Medieval Balkans|page= 150}}</ref>
* The [[Principality of Hungary|Hungarians]], after attacking [[Duchy of Swabia|Swabia]], sack and burn [[Basel]] (modern [[Switzerland]]). They invade [[Lorraine]] in [[Lotharingia]], destroying [[Verdun]] and [[Moyenmoutier]], and many monasteries in [[Duchy of Alsace|Alsace]]. Duke [[Arnulf, Duke of Bavaria|Arnulf I]] ('''the Bad''') with Hungarian military aid, reconquers his land from King [[Conrad I of Germany|Conrad I]] of the [[East Francia|East Frankish Kingdom]]. After this event, [[Duchy of Bavaria|Bavaria]] and Swabia agree to pay [[tribute]] to the Hungarians.
* [[Battle of Confey]]: The Norse [[Vikings]] under [[Sitric Cáech|Sigtrygg Caech]] defeat and kill King [[Augaire mac Ailella]] of [[Leinster]] in battle. Sigtrygg re-captures [[Kingdom of Dublin|Dublin]] and establishes himself as king, while his kinsman [[Ragnall ua Ímair]] returns to [[Kingdom of England|England]] to become [[List of monarchs of Northumbria#Kings of Northumbria in the Norse era|King of Northumbria]].

==== Britain ====
* Summer &ndash; Lady [[Æthelflæd]] of [[Mercia]] cements an [[Military alliance|alliance]] with King [[Constantine II of Scotland]] against [[Scandinavian York|Norse York]]. She captures the fortress at [[Derby]] (belonging to the [[Five Boroughs of the Danelaw]]), while her brother, King [[Edward the Elder]], takes [[Towcester]].<ref>Walker, Ian W (2000). ''Mercia and the Making of England Sutton''. {{ISBN|0-7509-2131-5}}.</ref> Æthelflæd's armies also ravage [[Brycheiniog]] ([[Wales]]) in revenge for killing the Mercian [[abbot]] Ecbryht (see [[916]]).
* [[Battle of Tempsford]]: The English army led by Edward the Elder defeats the Danish Vikings at [[Tempsford]]. They storm the fortified ''[[burh]]'' and kill King [[Guthrum II]] of [[Kingdom of East Anglia|East Anglia]], along with the Danish [[Earl|Jarls]] Toglos and Manna.

==== Islamic Empire ====
* [[Battle of San Esteban de Gormaz (917)|Battle of San Esteban de Gormaz]]: Umayyad forces under Abi-Abda [[besiege]] the ''[[repoblación]]'' of [[San Esteban de Gormaz]] (Northern [[Spain]]). King [[Ordoño II of León]] (supported by his brother [[Fruela II of Asturias]]) allies himself with [[Sancho I of Pamplona|Sancho I]], king of [[Kingdom of Pamplona|Pamplona]], and defeats the [[Moors]]. Abi-Abda is captured and executed by [[decapitation]].

==== Asia ====
* [[September 5]] &ndash; The [[Great Yue]] Kingdom, later renamed [[Southern Han]], is founded by [[Liu Yan (emperor)|Liu Yan]], former governor and military advisor, in Panyu (modern [[Guangdong]]) and [[Guangxi]]. Liu Yan declares himself emperor, and gives his niece Liu Hua in [[marriage]] to [[Wang Yanjun]], a son of his rival [[Wang Shenzhi]] (Prince of [[Min (Ten Kingdoms)|Min]]), to cement a relationship between the two states.</onlyinclude>