What was the previous name of Britain?

It’s called Britain.

The islands have been called Britain since Roman times, so where did the name "Britain" come from? This starts with the extremely chaotic immigration flow in the UK. Beginning in the 2nd century AD, the Germanic tribes who originally lived in the central and eastern parts of the European continent began to immigrate to Western Europe on a large scale due to the climate and the invasion of the Huns. This was the great ethnic migration in European history.

The two ethnic groups that have the greatest influence on Britain are the Angles who live in what is now northern Germany and Denmark, and the Saxons in Germany. A small Germanic tribe that crossed the sea from the mainland to the British Isles.

These martial Germans drove out the native Celts and occupied a large area of ??plains in the central and southern parts of the island of Great Britain. The Angles mainly settled in the east, and later East Anglia (East Anglia) in the United Kingdom was named after this; the Saxons mainly lived in the south, and today's "Middlesex", "Essex", "Sussex" and "Wessex" in central and southern Britain " and other place names, hence the name (meaning Central, East, South, and West Saxony respectively).

All these Germanic people who migrated to Britain were later collectively called "Anglo-Saxons" (Anglo-Saxons), and the area they occupied was named "Angloland" after the Angles. England), later further simplified to become what we call "England" today.

King Robert I of Scotland

The Germans were not able to exterminate the Celts. Those expelled Celts occupied the island of Ireland, while those who remained on the island of Great Britain , gradually divided into two parts - Wales in the west and Scotland in the north. Wales was divided for a long time, and Scotland later successfully unified and became the Kingdom of Scotland. The three political powers of England, Scotland, and Wales, which do not belong to each other, jointly form today's United Kingdom.