809

809 in various calendars
Gregorian calendar	809; DCCCIX
Ab urbe condita	1562
Armenian calendar	258; ԹՎ ՄԾԸ
Assyrian calendar	5559
Balinese saka calendar	730–731
Bengali calendar	216
Berber calendar	1759
Buddhist calendar	1353
Burmese calendar	171
Byzantine calendar	6317–6318
Chinese calendar	戊子年 (Earth Rat); 3506 or 3299; — to —; 己丑年 (Earth Ox); 3507 or 3300
Coptic calendar	525–526
Discordian calendar	1975
Ethiopian calendar	801–802
Hebrew calendar	4569–4570
Hindu calendars
- Vikram Samvat	865–866
- Shaka Samvat	730–731
- Kali Yuga	3909–3910
Holocene calendar	10809
Iranian calendar	187–188
Islamic calendar	193–194
Japanese calendar	Daidō 4; (大同４年)
Javanese calendar	705–706
Julian calendar	809; DCCCIX
Korean calendar	3142
Minguo calendar	1103 before ROC; 民前1103年
Nanakshahi calendar	−659
Seleucid era	1120/1121 AG
Thai solar calendar	1351–1352
Tibetan calendar	阳土鼠年; (male Earth-Rat); 935 or 554 or −218; — to —; 阴土牛年; (female Earth-Ox); 936 or 555 or −217

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	780s; 790s; 800s ; 810s; 820s;
Years:	806; 807; 808; 809 ; 810; 811; 812;

Year 809 (DCCCIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar, the 809th year of the Common Era (CE) and Anno Domini (AD) designations, the 809th year of the 1st millennium, the 9th year of the 9th century, and the 10th and last year of the 800s decade.

Events

Spring – Siege of Serdica: Krum, ruler (khan) of the Bulgarian Empire, captures the fortress of Serdica (modern Sofia), after a long siege.^[1] According to Byzantine sources, he massacres the garrison (supposedly 6,000 men), sacks the city, and razes the city walls, before returning with much loot to Bulgaria.^[2] In the following years (and centuries), Serdica will serve as a base for the expansion of the Bulgars to the south of the Balkans.

A Byzantine fleet lands in the Venetian Lagoon, and attacks a Frankish flotilla at Comacchio, but is defeated. Doge Obelerio degli Antenori marries a Frankish bride, Carola; she becomes the first dogaressa of Venice.
Aznar Galíndez I succeeds Aureolus, as count of Aragon (modern Spain). He is installed by King Louis the Pious (a son of emperor Charlemagne), and remains a Frankish vassal.
A rebellion in Gharb al-Andalus (modern Portugal) is crushed by the Emirate of Córdoba.^[3]

March 24 – Caliph Harun al-Rashid dies at Tus, on an expedition to put down an uprising in Khorasan (modern Iran). He is succeeded by his son Muhammad ibn Harun al-Amin.

Emperor Heizei becomes ill, and abdicates the throne in favor of his brother Saga, who is installed as the 52nd emperor of Japan.^[4]
Emperor Govinda III defeats his rival Nagabhata II, and obtains the submission of the Pala Empire (India).^[5]^[6]

Council of Aachen (809): Frankish bishops adopt the filioque addition in the Creed. Pope Leo III intervenes, and refuses to recognize it as valid.

^ Theophanes Confessor. Chronographia, p. 485
^ Fine 1991, p. 95.
^ Serrão, Joel; de Oliveira Marques, A. H. (1993). "O Portugal Islâmico". Hova Historia de Portugal. Portugal das Invasões Germânicas à Reconquista (in Portuguese). Lisbon: Editorial Presença. p. 125.
^ Emperor Saga, Saganoyamanoe Imperial Mausoleum, Imperial Household Agency
^ The Cambridge Shorter History of India, p. 143
^ Dynastic History of Magadha by George E. Somers, p. 179

Gregorian calendar	809 DCCCIX
Ab urbe condita	1562
Armenian calendar	258 ԹՎ ՄԾԸ
Assyrian calendar	5559
Balinese saka calendar	730–731
Bengali calendar	216
Berber calendar	1759
Buddhist calendar	1353
Burmese calendar	171
Byzantine calendar	6317–6318
Chinese calendar	戊子年 (Earth Rat) 3506 or 3299 — to — 己丑年 (Earth Ox) 3507 or 3300
Coptic calendar	525–526
Discordian calendar	1975
Ethiopian calendar	801–802
Hebrew calendar	4569–4570
Hindu calendars
- Vikram Samvat	865–866
- Shaka Samvat	730–731
- Kali Yuga	3909–3910
Holocene calendar	10809
Iranian calendar	187–188
Islamic calendar	193–194
Japanese calendar	Daidō 4 (大同４年)
Javanese calendar	705–706
Julian calendar	809 DCCCIX
Korean calendar	3142
Minguo calendar	1103 before ROC 民前1103年
Nanakshahi calendar	−659
Seleucid era	1120/1121 AG
Thai solar calendar	1351–1352
Tibetan calendar	阳土鼠年 (male Earth-Rat) 935 or 554 or −218 — to — 阴土牛年 (female Earth-Ox) 936 or 555 or −217