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Year 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.
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king muslim caliph byzantine abbasid chinese january emperor dies reign son al-wathiq dcccxlii empire japanese julian calendar era 20 succeeded
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 842 | - Kali Yuga | 3942–3943 | 1.00 | infobox |
| 842 | - Shaka Samvat | 763–764 | 1.00 | infobox |
| 842 | - Vikram Samvat | 898–899 | 1.00 | infobox |
| 842 | Ab urbe condita | 1595 | 1.00 | infobox |
| 842 | Armenian calendar | 291 ԹՎ ՄՂԱ | 1.00 | infobox |
| 842 | Assyrian calendar | 5592 | 1.00 | infobox |
| 842 | Balinese saka calendar | 763–764 | 1.00 | infobox |
| 842 | Bengali calendar | 248–249 | 1.00 | infobox |
| 842 | Berber calendar | 1792 | 1.00 | infobox |
| 842 | Buddhist calendar | 1386 | 1.00 | infobox |
| 842 | Burmese calendar | 204 | 1.00 | infobox |
| 842 | Byzantine calendar | 6350–6351 | 1.00 | infobox |
| 842 | Chinese calendar | 辛酉年 (Metal Rooster) 3539 or 3332 — to — 壬戌年 (Water Dog) 3540 or 3333 | 1.00 | infobox |
| 842 | Coptic calendar | 558–559 | 1.00 | infobox |
| 842 | Discordian calendar | 2008 | 1.00 | infobox |
| 842 | Ethiopian calendar | 834–835 | 1.00 | infobox |
| 842 | Gregorian calendar | 842 DCCCXLII | 1.00 | infobox |
| 842 | Hebrew calendar | 4602–4603 | 1.00 | infobox |
| 842 | Holocene calendar | 10842 | 1.00 | infobox |
| 842 | Iranian calendar | 220–221 | 1.00 | infobox |
| 842 | Islamic calendar | 227–228 | 1.00 | infobox |
| 842 | Japanese calendar | Jōwa 9 (承和９年) | 1.00 | infobox |
| 842 | Javanese calendar | 739–740 | 1.00 | infobox |
| 842 | Julian calendar | 842 DCCCXLII | 1.00 | infobox |
| 842 | Korean calendar | 3175 | 1.00 | infobox |
| 842 | Minguo calendar | 1070 before ROC 民前1070年 | 1.00 | infobox |
| 842 | Nanakshahi calendar | −626 | 1.00 | infobox |
| 842 | Seleucid era | 1153/1154 AG | 1.00 | infobox |
| 842 | Thai solar calendar | 1384–1385 | 1.00 | infobox |
| 842 | Tibetan calendar | ལྕགས་མོ་བྱ་ལོ་ (female Iron-Bird) 968 or 587 or −185 — to — ཆུ་ཕོ་ཁྱི་ལོ་ (male Water-Dog) 969 or 588 or −184 | 1.00 | infobox |
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