684

684 in various calendars
Gregorian calendar	684; DCLXXXIV
Ab urbe condita	1437
Armenian calendar	133; ԹՎ ՃԼԳ
Assyrian calendar	5434
Balinese saka calendar	605–606
Bengali calendar	91
Berber calendar	1634
Buddhist calendar	1228
Burmese calendar	46
Byzantine calendar	6192–6193
Chinese calendar	癸未年 (Water Goat); 3381 or 3174; — to —; 甲申年 (Wood Monkey); 3382 or 3175
Coptic calendar	400–401
Discordian calendar	1850
Ethiopian calendar	676–677
Hebrew calendar	4444–4445
Hindu calendars
- Vikram Samvat	740–741
- Shaka Samvat	605–606
- Kali Yuga	3784–3785
Holocene calendar	10684
Iranian calendar	62–63
Islamic calendar	64–65
Japanese calendar	Hakuchi 35; (白雉３５年)
Javanese calendar	576–577
Julian calendar	684; DCLXXXIV
Korean calendar	3017
Minguo calendar	1228 before ROC; 民前1228年
Nanakshahi calendar	−784
Seleucid era	995/996 AG
Thai solar calendar	1226–1227
Tibetan calendar	阴水羊年; (female Water-Goat); 810 or 429 or −343; — to —; 阳木猴年; (male Wood-Monkey); 811 or 430 or −342

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	660s; 670s; 680s ; 690s; 700s;
Years:	681; 682; 683; 684 ; 685; 686; 687;

Year 684 (DCLXXXIV) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 684 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

Wu Ze Tian takes power in China.
The Ummayad caliph Muawiya II is succeeded by Marwan I.
August 18 – Battle of Marj Rahit: Umayyad partisans defeat the supporters of Ibn al-Zubayr and cement Umayyad control of Syria.
September 7 – A large comet is observed in Japan (it's Japan's oldest observation record of the Halley's Comet).
November 13 – Emperor Temmu institutes eight titles of eight classes (Yakusa-no-kabane) in Japan.
November 26 – A great earthquake strikes Japan. The people, houses, temples, shrines and domestic animals are greatly damaged.

January 10 – K'inich Kan B'alam II accedes to the rulership of the Maya polity of Palenque.