The year is 410 AD the traditional end of the Roman occupation of Britain. With the end of centralized rule what replaces it, how can we come to any conclusions with the sources almost nonexistent?

Music: Celtic Impulse - Celtic by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)

Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100297

Artist: http://incompetech.com/

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