Year 1021 (MXXI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.
1021 in various calendars
1021
MXXI
1774
470
ԹՎ ՆՀ
5771
942–943
428
1971
N/A
1565
383
6529–6530
庚申年 (Metal Monkey)
3718 or 3511
— to —
辛酉年 (Metal Rooster)
3719 or 3512
737–738
2187
1013–1014
4781–4782
1077–1078
942–943
4121–4122
11021
21–22
399–400
411–412
923–924
1021
MXXI
3354
891 before ROC
民前891年
−447
1332/1333 AG
1563–1564
阳金猴年
(male Iron-Monkey)
1147 or 766 or −6
— to —
阴金鸡年
(female Iron-Rooster)
1148 or 767 or −5
Our result of AD 1021 for the cutting year constitutes the only secure calendar date for the presence of Europeans across the Atlantic before the voyages of Columbus [in1492]. Moreover, the fact that our results, on three different trees, converge on the same year is notable and unexpected. This coincidence strongly suggests Norse activity at L'Anse aux Meadows in AD 1021.