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Millennium: 1st millennium
917 in various calendars
Gregorian calendar 917
Ab urbe condita 1670
Armenian calendar 366
Assyrian calendar 5667
Balinese saka calendar 838–839
Bengali calendar 324
Berber calendar 1867
Buddhist calendar 1461
Burmese calendar 279
Byzantine calendar 6425–6426
Chinese calendar 丙子(Fire Rat)
3613 or 3553
    — to —
丁丑年 (Fire Ox)
3614 or 3554
Coptic calendar 633–634
Discordian calendar 2083
Ethiopian calendar 909–910
Hebrew calendar 4677–4678
Hindu calendars
 - Vikram Samvat 973–974
 - Shaka Samvat 838–839
 - Kali Yuga 4017–4018
Holocene calendar 10917
Iranian calendar 295–296
Islamic calendar 304–305
Japanese calendar Engi 17
Javanese calendar 816–817
Julian calendar 917
Korean calendar 3250
Minguo calendar 995 before ROC
Nanakshahi calendar −551
Seleucid era 1228/1229 AG
Thai solar calendar 1459–1460
Tibetan calendar 阳火鼠年
(male Fire-Rat)
1043 or 662 or −110
    — to —
(female Fire-Ox)
1044 or 663 or −109
The Bulgarian victory at the Achelous River.
Map of the Battle of Achelous.

Year 917 (CMXVII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.


By place

Byzantine Empire

  • August 20Battle of Achelous: A Byzantine expeditionary force (62,000 men) under General Leo Phokas (the Elder) is routed by the Bulgarians at the 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 (the Great) becomes de facto ruler of the whole Balkan Peninsula, except the well-protected Byzantine capital of Constantinople and the Peloponnese.[1]
  • Fall – 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.[2]



Arabian Empire





  1. ^ Brain Todd Carey (2012). Road to Manzikert: Byzantine and Islamic Warfare 527–1071, pp. 78–81. ISBN 978-1-84884-215-1.
  2. ^ Lynda Garland (April 1, 2002). Byzantine Empresses: Woman and Power in Byzantium AD 527-1204. Routledge. p. 122. 
  3. ^ John V.A. Fine, Jr. (1991). The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 150. ISBN 978-0-472-08149-3.
  4. ^ Walker, Ian W (2000). Mercia and the Making of England Sutton. ISBN 0-7509-2131-5.
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