891

891 in various calendars
Gregorian calendar	891; DCCCXCI
Ab urbe condita	1644
Armenian calendar	340; ԹՎ ՅԽ
Assyrian calendar	5641
Balinese saka calendar	812–813
Bengali calendar	298
Berber calendar	1841
Buddhist calendar	1435
Burmese calendar	253
Byzantine calendar	6399–6400
Chinese calendar	庚戌年 (Metal Dog); 3588 or 3381; — to —; 辛亥年 (Metal Pig); 3589 or 3382
Coptic calendar	607–608
Discordian calendar	2057
Ethiopian calendar	883–884
Hebrew calendar	4651–4652
Hindu calendars
- Vikram Samvat	947–948
- Shaka Samvat	812–813
- Kali Yuga	3991–3992
Holocene calendar	10891
Iranian calendar	269–270
Islamic calendar	277–278
Japanese calendar	Kanpyō 3; (寛平３年)
Javanese calendar	789–790
Julian calendar	891; DCCCXCI
Korean calendar	3224
Minguo calendar	1021 before ROC; 民前1021年
Nanakshahi calendar	−577
Seleucid era	1202/1203 AG
Thai solar calendar	1433–1434
Tibetan calendar	阳金狗年; (male Iron-Dog); 1017 or 636 or −136; — to —; 阴金猪年; (female Iron-Pig); 1018 or 637 or −135

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	870s; 880s; 890s ; 900s; 910s;
Years:	888; 889; 890; 891 ; 892; 893; 894;

Year 891 (DCCCXCI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.

Events

February 21 – Guy III, duke of Spoleto, is crowned Holy Roman Emperor by Pope Stephen V. His son Lambert is proclaimed king of Italy, at the capital of Pavia in Lombardy.^[1]
Summer – Orso, Lombard prince of Benevento, is deposed after the capture of Benevento by the Byzantines. Benevento becomes the capital of the thema of Longobardia.^[2]
Battle of Leuven: Viking raiders on the Dyle River (near Leuven), in modern-day Belgium, suffer a crushing defeat by Frankish forces under King Arnulf of Carinthia.

June 2 – Al-Muwaffaq, an Abbasid prince and Commander-in-chief, dies at the capital of Baghdad. His son Al-Mu'tadid is recognized as regent, and second heir of the Abbasid Caliphate.

February 25 – Fujiwara no Mototsune, a Japanese statesman, dies. In his lifetime, he had forced the resignation of Emperor Yōzei and become head of the Fujiwara clan.

September 14 – Pope Stephen V dies after a 6-year reign. He is succeeded by Formosus, former cardinal bishop of Portus, as the 111th pope of the Catholic Church.

Gregorian calendar	891 DCCCXCI
Ab urbe condita	1644
Armenian calendar	340 ԹՎ ՅԽ
Assyrian calendar	5641
Balinese saka calendar	812–813
Bengali calendar	298
Berber calendar	1841
Buddhist calendar	1435
Burmese calendar	253
Byzantine calendar	6399–6400
Chinese calendar	庚戌年 (Metal Dog) 3588 or 3381 — to — 辛亥年 (Metal Pig) 3589 or 3382
Coptic calendar	607–608
Discordian calendar	2057
Ethiopian calendar	883–884
Hebrew calendar	4651–4652
Hindu calendars
- Vikram Samvat	947–948
- Shaka Samvat	812–813
- Kali Yuga	3991–3992
Holocene calendar	10891
Iranian calendar	269–270
Islamic calendar	277–278
Japanese calendar	Kanpyō 3 (寛平３年)
Javanese calendar	789–790
Julian calendar	891 DCCCXCI
Korean calendar	3224
Minguo calendar	1021 before ROC 民前1021年
Nanakshahi calendar	−577
Seleucid era	1202/1203 AG
Thai solar calendar	1433–1434
Tibetan calendar	阳金狗年 (male Iron-Dog) 1017 or 636 or −136 — to — 阴金猪年 (female Iron-Pig) 1018 or 637 or −135