631

631 in various calendars
Gregorian calendar	631; DCXXXI
Ab urbe condita	1384
Armenian calendar	80; ԹՎ Ձ
Assyrian calendar	5381
Balinese saka calendar	552–553
Bengali calendar	38
Berber calendar	1581
Buddhist calendar	1175
Burmese calendar	−7
Byzantine calendar	6139–6140
Chinese calendar	庚寅年 (Metal Tiger); 3328 or 3121; — to —; 辛卯年 (Metal Rabbit); 3329 or 3122
Coptic calendar	347–348
Discordian calendar	1797
Ethiopian calendar	623–624
Hebrew calendar	4391–4392
Hindu calendars
- Vikram Samvat	687–688
- Shaka Samvat	552–553
- Kali Yuga	3731–3732
Holocene calendar	10631
Iranian calendar	9–10
Islamic calendar	9–10
Japanese calendar	N/A
Javanese calendar	521–522
Julian calendar	631; DCXXXI
Korean calendar	2964
Minguo calendar	1281 before ROC; 民前1281年
Nanakshahi calendar	−837
Seleucid era	942/943 AG
Thai solar calendar	1173–1174
Tibetan calendar	阳金虎年; (male Iron-Tiger); 757 or 376 or −396; — to —; 阴金兔年; (female Iron-Rabbit); 758 or 377 or −395

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	610s; 620s; 630s ; 640s; 650s;
Years:	628; 629; 630; 631 ; 632; 633; 634;

Year 631 (DCXXXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 631 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Emperor Heraclius appoints Cyrus, patriarch of Alexandria, with power to act as viceroy (dioikesis) of Egypt. He begins a 10-year persecution against the non-Chalcedonian Coptic Christians.

Battle of Wogastisburg: The Slavs under King Samo defeat the Austrasian Franks, in a three-day battle near Trenčín (modern Slovakia). King Dagobert I is forced to retreat; the Franks with their allies are slaughtered. Samo invades Thuringia and undertakes looting raids.^[1]
King Suintila is overthrown after a 10-year reign by his son Sisenand, with the aid of Dagobert I. The Visigothic nobles offer him a 500-pound plate made of pure gold. Sisenand becomes new king of the Visigothic Kingdom and declares his father a tyrant for his many crimes.
The Saxons (Northern Germany) appeal to Dagobert I, against the yearly tribute (500 cows) which they still pay (approximate date).

King Edwin of Northumbria re-fortifies the city walls of York, probably including the building of the so-called Anglian Tower (approximate date).

Azarmidokht (daughter of king Khosrau II) succeeds her sister Borandukht, as monarch of the Persian Empire.
Azarmidokht is succeeded after a few months reign by Khosrau IV, who becomes new ruler (shah) of Persia.
Hormizd VI proclaims himself king in Nisibis (Turkey). He seizes the throne and will reign until 632.

Emperor Tai Zong sends envoys to the Xueyantuo, vassals of the Eastern Turkic Khaganate, bearing gold and silk in order to obtain the release of enslaved Chinese prisoners, who were captured during the transition from the Sui to the Tang Dynasty from the northern frontier. The embassy succeeds in freeing 80,000 men and women, who are safely returned to China.
Tai Zong establishes a new Daoist abbey, out of gratitude for Daoist priests who had apparently cured the crown prince of an illness.

Benjamin I, Coptic patriarch of Alexandria, escapes during the persecutions of his fellow Christians and hides in the monastery of St. Macarius (Upper Egypt).
Xuanzang, Chinese Buddhist monk, crosses the Indus River at Hund and travels to Kashmir ("Heaven on Earth") in northwestern India (approximate date).