This was still very much a period of time dominated by violent
struggles to hold onto settlements and thrones.
The boundaries of the various kingdoms changed, seemingly
overnight in some cases.
The boundaries of Celtish and Welsh kingdoms changed as well,
depending on who was running Wessex or Mercia or Northumbria at
the time.
What we call England today looked very different in 630, 796, and
829.
Source: British History Atlas
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