842

842 in other calendars
Gregorian calendar	842; DCCCXLII
Ab urbe condita	1595
Armenian calendar	291; ԹՎ ՄՂԱ
Assyrian calendar	5592
Balinese saka calendar	763–764
Bengali calendar	249
Berber calendar	1792
Buddhist calendar	1386
Burmese calendar	204
Byzantine calendar	6350–6351
Chinese calendar	辛酉年 (Metal Rooster); 3538 or 3478; — to —; 壬戌年 (Water Dog); 3539 or 3479
Coptic calendar	558–559
Discordian calendar	2008
Ethiopian calendar	834–835
Hebrew calendar	4602–4603
Hindu calendars
- Vikram Samvat	898–899
- Shaka Samvat	763–764
- Kali Yuga	3942–3943
Holocene calendar	10842
Iranian calendar	220–221
Islamic calendar	227–228
Japanese calendar	Jōwa 9; (承和９年)
Javanese calendar	739–740
Julian calendar	842; DCCCXLII
Korean calendar	3175
Minguo calendar	1070 before ROC; 民前1070年
Nanakshahi calendar	−626
Seleucid era	1153/1154 AG
Thai solar calendar	1384–1385
Tibetan calendar	阴金鸡年; (female Iron-Rooster); 968 or 587 or −185; — to —; 阳水狗年; (male Water-Dog); 969 or 588 or −184

Millennium:	1st millennium
Centuries:	8th century – 9th century – 10th century
Decades:	810s 820s 830s – 840s – 850s 860s 870s
Years:	839 840 841 – 842 – 843 844 845

842 (DCCCXLII) was a common year starting on Sunday of the Julian calendar, the 842nd year of the Common Era (CE) and Anno Domini (AD) designations, the 842nd year of the 1st millennium, the 42nd year of the 9th century, and the 3rd year of the 840s decade. As of the start of 842, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.

Events

February 14 – Charles the Bald and Louis the German sign a treaty.
Oaths of Strasbourg — alliance of Louis the German and Charles the Bald against emperor Lothar — sworn and recorded in vernacular languages.
Ramiro I succeeds Alfonso II as king of Asturias.
Uurad is succeeded by Bred, then Ciniod.
Charles the Bald marries Ermentrude.
Three year old Michael III succeeds Theophilus (emperor) as emperor of Byzantium.
End of the reign of caliph Moqtasim.
Uyghurs leave the Mongolian plateau.