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Answer:
Britain was under Roman control but When the Romans retreated from Britain, the barbarians started to attack . Since the roman army had already retreated from Britain, under the generalship of Constantine third. Some of the groups such as Picts of Scotland had attacked Britain in the past, and some groups who didn't have a history of attacking Britain started to do so during the first half of the fifth century. The first time attackers were the Angles and Saxons and the Jutes.
Romans abandoned Britain in 410, it was invaded by Saxons, angles and jutes.
Why roman left Britain, and what happened to Britain after they left?
The Romans conquered Britain and ruled for 400 years, but they left in 410 as Italy their home country was attacked by tribes and more soldiers were needed back in Rome.
After the Romans left, i.e. in 449 Britain was invaded by the Saxons, angles and jutes which led to the transit of Christians to France. The environment become hostile to Christians and illiteracy increased.
Therefore, after Romans abandoned Britain it was invaded by Saxons, angles and jutes.
Learn more about the reason why Romans left Britain and its effect on Britain:
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