Brexit, its roots in history

The exit of the United Kingdom from the European union has deep historical roots, if we really want to understand the events we must start from long time ago, since otherwise we are at risk of defective or false understanding.
Let’s start from the beginning: in year 410 after Christ, the Emperor of the Occidental Part of the Roman Empire, Honorius decided to withdraw from Britain.
In reality, this was a consequence of previous events, starting from year 383, with various, unsuccessful, attempts of local military high commanders to become Emperor (Magnus Maximus from 383 to 388, Constantine III in 407).
On the other side, due to the general situation of the Empire, probably Honorius had no alternative but to leave Britain.
Britons, that were a Celtic people, maybe more Romanized than the Roman themselves, felt betrayed. This is why the main leader who had been trying to save the Roman culture, whose latinized name was Artorius, had become a mythical hero, under the name of king Arthur. We do not know whether he was a Roman or a Briton, the quotations from Nennius in his “Historia Brittonum”, written after several centuries (year 830 about), as well as from other texts, are not enough precise, however most historians agree that he was a real person.
Among the consequences the fact that now, in the world, we have two different juridical systems: the Civil Law, that evolved in continental Europe from the Roman law through the codification made by the emperor Justinian in the VI century (Corpus Iuris Civilis), and the Common Law that evolved directly from the Roman law, and was then made the only law of the kingdom by Henry the second (Comune Ley).
However, during the so called “Middle Age”, England was part of the Christianity, namely of the civilization that was, at that time, identified with the Catholic Church and the remnants of the Roman Empire and that we consider the root of the Occidental civilization.
The kingdom of Henry the second, who had severe controversies with the Church that culminated with the killing of the Archi-bishop of Canterbury, was a forerunner of Brexit: in reality, the controversy with the Church was due to his willingness to impose his jurisdiction to the English Church through the “Comune Ley”
Then Henry the VIII made his “Brexit”, that was due to his personal problems, at least in part: however it had a deep root starting from twelfth century, he could do it because of those roots, otherwise he would be at risk of losing his throne.
England, and then the United Kingdom, was involved in the politics of continental Europe with variable intensity from then to the XIX century, but on the other side managed to build its extra-European Empire that started to dissolve after the 1.st World War but, at least in party, lasted until middle of XX century. In general, in the XX century, the United Kingdom was deeply involved in continental Europe and eventually joined the European Union.