Europe and the Faith continues, as Hilaire Belloc makes some suppositions that archaeologists and historians today have come to agree with.
The Roman Empire faced internal turmoil and pulled back its legions (temporarily) from Britain. Problem was, temporarily lasted forever. So what happened in the 150 years between the legions’ going and St. Augustine of Canterbury’s coming? Kinda tough to tell, given the dearth of written evidence. But not impossible….