The 3rd and 4th centuries are times of prosperity and wealth in Britain, at least for some parts. With the rise of local usurpers and the Diocletian reforms Roman Britain returns to peace just in time for Christianity to arrive.

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/

Books Referenced