803

803 in various calendars
Gregorian calendar	803; DCCCIII
Ab urbe condita	1556
Armenian calendar	252; ԹՎ ՄԾԲ
Assyrian calendar	5553
Balinese saka calendar	724–725
Bengali calendar	210
Berber calendar	1753
Buddhist calendar	1347
Burmese calendar	165
Byzantine calendar	6311–6312
Chinese calendar	壬午年 (Water Horse); 3500 or 3293; — to —; 癸未年 (Water Goat); 3501 or 3294
Coptic calendar	519–520
Discordian calendar	1969
Ethiopian calendar	795–796
Hebrew calendar	4563–4564
Hindu calendars
- Vikram Samvat	859–860
- Shaka Samvat	724–725
- Kali Yuga	3903–3904
Holocene calendar	10803
Iranian calendar	181–182
Islamic calendar	187–188
Japanese calendar	Enryaku 22; (延暦２２年)
Javanese calendar	698–699
Julian calendar	803; DCCCIII
Korean calendar	3136
Minguo calendar	1109 before ROC; 民前1109年
Nanakshahi calendar	−665
Seleucid era	1114/1115 AG
Thai solar calendar	1345–1346
Tibetan calendar	阳水马年; (male Water-Horse); 929 or 548 or −224; — to —; 阴水羊年; (female Water-Goat); 930 or 549 or −223

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	780s; 790s; 800s ; 810s; 820s;
Years:	800; 801; 802; 803 ; 804; 805; 806;

Year 803 (DCCCIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.

Events

Emperors Nikephoros I and Charlemagne settle their imperial boundaries in the Adriatic Sea, and sign the Pax Nicephori ("Peace of Nikephoros"). The Byzantines retain control of the coastal cities and islands in Dalmatian Croatia, while Frankish rule is accepted over Istria and the Dalmatian hinterland.^[1] Venice is recognized as independent by the Byzantine Empire.
Summer – Bardanes Tourkos, Byzantine general (strategos), is proclaimed emperor by the troops of the Anatolic, Opsikion, Thracian and Bucellarian themes. The 'rebel' army marches to Chrysopolis, a suburb of Constantinople. After the defection of two of his trusted aids, future emperors Leo the Armenian and Michael the Amorian, Bardanes negotiates peace.

May – Krum, ruler (khan) of the Bulgarian Empire, begins his territorial expansion and raids the Byzantine northern frontier. He leads his warriors — mostly Bulgars, Slavs, Thracians and Macedonians — across the Carpathian Mountains, over the Danube River, and throughout Transylvania, Thrace, and Macedonia.
St. Peter Stiftskulinarium, possibly Central Europe's oldest restaurant, is founded in Salzburg, Austria.^[2]

Downfall of the Barmakids: Caliph Harun al-Rashid has his friend Ja'far ibn Yahya beheaded, possibly for having an affair with his sister Abbasa. The surviving members of the influential Barmakid family are imprisoned on the orders of Harun, and their property is confiscated.

The 803 Mopsuestia earthquake takes place in the vicinity of Mopsuestia, and the Gulf of Alexandretta (İskenderun) ^[3]

October 12 – The Synod of Clofesho (possibly Brixworth) is held, at which the Archbishopric of Lichfield is demoted to an ordinary bishopric, with papal permission obtained by King Coenwulf of Mercia.

Du Mu, Chinese poet and official (d. 852)
Emma of Altdorf, Frankish queen and wife of King Louis the German of East Francia (died 876)
Ibn 'Abd al-Hakam, Muslim historian (d. 871)
Liu Congjian, Chinese governor (d. 843)

^ Florin Curta: Southeastern Europe in the Middle Ages, 500-1250, p. 135.
^ MYTravelGuide Archived July 14, 2011, at the Wayback Machine Stifskeller St Peter.
^ Antonopoulos, 1980