| | | 835 | Vikings invade Sheppey  |
 A-S C
| It appears that the raid on the Isle of Sheppey in Kent was the start of a trend of attacks by the Vikings. |
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| 836 | Ireland raided by the Vikings |
| A-S C
| Up until now the Vikings had raided islands and coastal communities but now they launched inland attacks. The Vikings attacked Southern Ui Néill and they took captives. |
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| Viking invade Devon |
| A fleet of possibly 35 ships landed a Viking army in Devon. Egbert fought the Vikings at Carhampton but was defeated by the invaders. |
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| 837 | Battle of Hingston Down |
| A-S C
| A Viking raiding party assisted by local cornish men was defeated by Egbert of Wessex. |
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| 839 | Ethulwulf becomes king of Wessex |
| A-S C
| Egbert was followed by his son Ethulwulf as King of Wessex. |
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| 845 | Vikings in Ireland |
| A-S C
| The Vikings captured Forannán, the Abbot of Armagh. Attempts to drive the Vikings out failed and the Vikings won a key battle at the fortress on the Rock of Dunamase. |
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| 846 | Mael Sechnaill high king of Ireland |
| A-S C
| Mael Sechnaill became the high king of Ireland. Died in 862. |
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| 849 | Alfred 'the Great' is born |
| A-S C
| Alfred was the fifth son of Ethelwulf, King of Wessex. |
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