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648 in various calendars
Gregorian calendar	648; DCXLVIII
Ab urbe condita	1401
Armenian calendar	97; ԹՎ ՂԷ
Assyrian calendar	5398
Balinese saka calendar	569–570
Bengali calendar	55
Berber calendar	1598
Buddhist calendar	1192
Burmese calendar	10
Byzantine calendar	6156–6157
Chinese calendar	丁未年 (Fire Goat); 3345 or 3138; — to —; 戊申年 (Earth Monkey); 3346 or 3139
Coptic calendar	364–365
Discordian calendar	1814
Ethiopian calendar	640–641
Hebrew calendar	4408–4409
Hindu calendars
- Vikram Samvat	704–705
- Shaka Samvat	569–570
- Kali Yuga	3748–3749
Holocene calendar	10648
Iranian calendar	26–27
Islamic calendar	27–28
Japanese calendar	Taika 4; (大化４年)
Javanese calendar	539–540
Julian calendar	648; DCXLVIII
Korean calendar	2981
Minguo calendar	1264 before ROC; 民前1264年
Nanakshahi calendar	−820
Seleucid era	959/960 AG
Thai solar calendar	1190–1191
Tibetan calendar	阴火羊年; (female Fire-Goat); 774 or 393 or −379; — to —; 阳土猴年; (male Earth-Monkey); 775 or 394 or −378

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	620s; 630s; 640s ; 650s; 660s;
Years:	645; 646; 647; 648 ; 649; 650; 651;

Year 648 (DCXLVIII) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 648 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 Constans II issues an imperial edict forbidding Monothelitism to be discussed, to quiet the intense controversy caused by the Monothelete doctrine. This edict, distributed by patriarch Paul II in Constans' name, is known as the Typos.

King Sigebert III of Austrasia is advised by Remaclus to establish a double-monastery, at Stavelot and Malmedy. As a missionary bishop, he founds an abbey on the River Amblève (modern Belgium).

King Cenwalh of Wessex returns from a 3-year exile in East Anglia, to reclaim his kingdom. He gives 3,000 hides of land around Ashdown to his nephew Cuthred, possibly sub-king of Berkshire (England).
Cenwahl invites bishop Birinus to establish under his direction the Old Minster in Winchester. Together they have a small stone church built.^[1]

Tang general Ashina She'er re-establishes Tang control of Karasahr, and leads a military campaign against the Tarim Basin kingdom of Kucha in Xinjiang, a vassal of the Western Turkic Khaganate.

In an early skirmish in the run up to the Second Tikal–Calakmul War, Bʼalaj Chan Kʼawiil scores a military victory, apparently over his half-brother, who had galled him by using the same royal emblem (or emblem glyph) as he did.
Dos Pilas breaks away from Tikal and becomes a vassal state of Calakmul.

The Book of Jin is compiled in China during the Tang dynasty. Its chief editor is the chancellor Fang Xuanling, who dies in this year as well.

^ Kirby 2000, p. 45.
^ Teule, Herman G. B. (2011). "Yuḥanon of the Sedre". In Sebastian P. Brock; Aaron M. Butts; George A. Kiraz; Lucas Van Rompay (eds.). Gorgias Encyclopedic Dictionary of the Syriac Heritage: Electronic Edition. Retrieved July 8, 2020.

Kirby, D. P. (2000). The Earliest English Kings (revised ed.). Routledge. ISBN 0-415-24211-8.