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| 0839 | Succession |  |
| Wessex Gives Kent, Essex, Surrey & Sussex to his eldest son Athelstan |
| Wessex Succeeds as King of Wessex |
| 0850 | Invasion of England | |
| The Vikings winter in England |
| 0851 | Battle of Aclea | |
| Aclea Wipes out a Viking force transported by 350 ships sth of the Thames |
| 0854 | Invasion of England | |
| The Vikings winter in England |
| 0855 | Diplomacy | |
| 1st recorded state visit of an English King to a Continental Court |
| Rome 1st recorded state visit of an English King to a Continental Court |
| Visits Rome, taking the future King Alfred with him |
| Rome Visits Rome, taking the future King Alfred with him |
| Visits the Court of Charles the Bald |
| Rome Visits the Court of Charles the Bald |
| 0855 | Marriage | |
| Wessex Marries Judith, daughter of Charles the Bald |
| 0856 | Rule of Essex | |
| Essex Gives up the heart of Wessex to Aethelbald, keeping Kent, Sussex, Surrey & Essex |
| 0856 | Rule of Kent | |
| Kent Gives up the heart of Wessex to Aethelbald, keeping Kent, Sussex, Surrey & Essex |
| 0856 | Rule of Surrey | |
| Surrey Gives up the heart of Wessex to Aethelbald, keeping Kent, Sussex, Surrey & Essex |
| 0856 | Rule of Sussex | |
| Sussex Gives up the heart of Wessex to Aethelbald, keeping Kent, Sussex, Surrey & Essex |
