840: Bliain
| Blianta: 837 838 839 - 840 () - 841 842 843 | |
| Deicheanna blianta: 810í 820í 830í - 840í - 850í 860í 870í | |
| Céadta blianta: 8ú céad - 9ú céad - 10ú céad | |
Eachtraí
Breitheanna
Básanna
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