657

657 in various calendars
Gregorian calendar	657; DCLVII
Ab urbe condita	1410
Armenian calendar	106; ԹՎ ՃԶ
Assyrian calendar	5407
Balinese saka calendar	578–579
Bengali calendar	64
Berber calendar	1607
Buddhist calendar	1201
Burmese calendar	19
Byzantine calendar	6165–6166
Chinese calendar	丙辰年 (Fire Dragon); 3354 or 3147; — to —; 丁巳年 (Fire Snake); 3355 or 3148
Coptic calendar	373–374
Discordian calendar	1823
Ethiopian calendar	649–650
Hebrew calendar	4417–4418
Hindu calendars
- Vikram Samvat	713–714
- Shaka Samvat	578–579
- Kali Yuga	3757–3758
Holocene calendar	10657
Iranian calendar	35–36
Islamic calendar	36–37
Japanese calendar	Hakuchi 8; (白雉８年)
Javanese calendar	548–549
Julian calendar	657; DCLVII
Korean calendar	2990
Minguo calendar	1255 before ROC; 民前1255年
Nanakshahi calendar	−811
Seleucid era	968/969 AG
Thai solar calendar	1199–1200
Tibetan calendar	阳火龙年; (male Fire-Dragon); 783 or 402 or −370; — to —; 阴火蛇年; (female Fire-Snake); 784 or 403 or −369

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	630s; 640s; 650s ; 660s; 670s;
Years:	654; 655; 656; 657 ; 658; 659; 660;

Year 657 (DCLVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 657 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

Grimoald the Elder, mayor of the palace of Austrasia, is deposed by Clovis II, king of Neustria. Clovis also captures Grimoald's son Childebert the Adopted, executing them both.
Clovis II dies and is succeeded by his eldest son Chlothar III, age 5, who becomes king of Neustria and Burgundy, under the regency of his mother Balthild.

Battle of Siffin: Muslim forces under Ali ibn Abi-Talib fight an inconclusive battle against Mu'awiya I, on the banks of the Euphrates, near Raqqa (Syria).

Tang campaigns against the Western Turks: Emperor Gao Zong dispatches a military campaign led by Su Dingfang. He annexes the Western Turkic Khaganate.
Gao Zong commissions the pharmacology publication of an official materia medica, documenting the use of 833 different substances for medicinal purposes.

In the course of the Second Tikal–Calakmul War, the Snake Lord (Yuknoom Ch'een II) makes a direct attack against Tikal itself, driving out its new ruler Nuun Ujol Chaak, and establishing Calakmul as the regional superpower. Bʼalaj Chan Kʼawiil, the one time heir apparent to rule Tikal, swears his allegiance to the new overlord.

June 1 – Pope Eugene I dies at Rome after a reign of nearly 2½ years. He is succeeded by Vitalian as the 76th pope.
Hilda, Anglo-Saxon abbess, founds a monastery at Streaneshalch, on the Yorkshire coast at Whitby (England).^[1]

^ "Saint Hilda of Whitby | English abbess". Encyclopedia Britannica. Retrieved February 14, 2020.