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The 1040s was a decade that began on 1 January 1040 and ended on 31 December 1049.
| Millennium: | 2nd millennium |
| Centuries: | 10th century – 11th century – 12th century |
| Decades: | 1010s 1020s 1030s – 1040s – 1050s 1060s 1070s |
| Years: | 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
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