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| 0849 | Succession |  |
| Northumbria Succeeds as King of Northumbria
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| 0863 | Succession |  |
| Northumbria Aelle joins Osbert as co-ruler of Northumbria
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| 0866 | Abdication |  |
| Lindesfarne Deposed after capturing Lindesfarne from the Church
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| 0867 | Capture |  |
| York Killed in battle trying to recapture York from the Vikings
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| 0867 | Death |  |
| York Death of York, killed in battle trying to recapture York from the Vikings
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| 0867 | Siege of York |  |
| York Following the loss of York, Osberht and ’lla form an alliance against the Danes, they launch a counterattack, but the Danes kill both Osberht and ’lla and set up a puppet king on Northumbrian throne
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| York Killed in battle trying to recapture York from the Vikings
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| 1460 | Arrest |  |
| 25th June Sandwich Ordered to take 500 men to reinforce Somerset's Army but is captured in & executed
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| 1460 | Death |  |
| 25th June Sandwich Death of Osbert Mountford, executed
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| 1460 | Execution |  |
| 25th June Sandwich Ordered to take 500 men to reinforce Somerset's Army but is captured executed
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| 1460 | Siege of Calais |  |
| 25th June Calais Ordered to take 500 men to reinforce Somerset's Army but is captured executed
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