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671 in various calendars
Gregorian calendar	671; DCLXXI
Ab urbe condita	1424
Armenian calendar	120; ԹՎ ՃԻ
Assyrian calendar	5421
Balinese saka calendar	592–593
Bengali calendar	78
Berber calendar	1621
Buddhist calendar	1215
Burmese calendar	33
Byzantine calendar	6179–6180
Chinese calendar	庚午年 (Metal Horse); 3368 or 3161; — to —; 辛未年 (Metal Goat); 3369 or 3162
Coptic calendar	387–388
Discordian calendar	1837
Ethiopian calendar	663–664
Hebrew calendar	4431–4432
Hindu calendars
- Vikram Samvat	727–728
- Shaka Samvat	592–593
- Kali Yuga	3771–3772
Holocene calendar	10671
Iranian calendar	49–50
Islamic calendar	50–51
Japanese calendar	Hakuchi 22; (白雉２２年)
Javanese calendar	562–563
Julian calendar	671; DCLXXI
Korean calendar	3004
Minguo calendar	1241 before ROC; 民前1241年
Nanakshahi calendar	−797
Seleucid era	982/983 AG
Thai solar calendar	1213–1214
Tibetan calendar	阳金马年; (male Iron-Horse); 797 or 416 or −356; — to —; 阴金羊年; (female Iron-Goat); 798 or 417 or −355

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	650s; 660s; 670s ; 680s; 690s;
Years:	668; 669; 670; 671 ; 672; 673; 674;

Year 671 (DCLXXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 671 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

Perctarit returns to Lombardy from exile and reclaims his realm, which is being ruled on behalf of Garibald, since his father King Grimoald I died. He deposes the young king, and becomes the new ruler of the Lombard Kingdom in Italy. During his reign Perctarit makes Catholicism the official religion, but does not recognize papal authority.^[2] Grimoald is buried in the St. Ambrogio Church (Milan).

Battle of Two Rivers: King Ecgfrith of Northumbria defeats the Picts under King Drest VI, in the vicinity of Moncreiffe Island, near Perth (Scotland).^[3] After the battle the Picts are reduced to slavery, and subject to the yoke of captivity for the next 14 years.^[4]

Yijing, Chinese Buddhist monk, travels by boat from Guangzhou, and visits the capital of the partly Buddhist kingdom of Srivijaya in Palembang (Indonesia). He stays for 6 months to study Sanskrit grammar and the Malay language.
June 10 – Emperor Tenji introduces a water clock (clepsydra) called Rokoku. The instrument, which measures time and indicates hours, is placed in the capital of Ōtsu in Japan.^[5]
Silla seizes control of the former Baekje capital of Sabi from the Tang Protectorate General to Pacify the East.

^ F. Espenak (2009). "Annular Solar Eclipse of 0671 Dec 07" (PDF). NASA. Archived (PDF) from the original on October 9, 2022. Retrieved May 29, 2015.
^ Brown, T. S. The New Cambridge Medieval History: II. c. 700 - c. 900. p. 321.
^ Fraser, James E. (2006). "The Pictish Conquest", p.59
^ Colgrave, Bertram (1927). "The Life of Bishop Wilfrid", Cambridge University. ISBN 978-0521-31387-2
^ "Why is June 10 known as Time Memorial Day?". Seiko Institute of Horology. Archived from the original on February 12, 2012. Retrieved April 17, 2012.