Britannia

Okay kiddo, Britannia is a word that used to refer to the island that is now called Great Britain. That's the big island in Europe where England, Scotland and Wales are. People started using the word Britannia a long time ago, when the Romans invaded Britain in the year 43!

The Romans thought Britannia was full of riches, so they named it after a goddess - a magical lady they worshiped. They thought she was the protector of the island. They even made coins with her face on it to show how important she was.

After the Romans, lots of different people lived on the island and took control of it, including the Anglo-Saxons, the Vikings and the Normans. But even with all those different rulers and people, the name Britannia stayed.

These days, Britannia is sometimes still used as a symbol of England - like on some coins, or the logo for the Royal Navy. Sometimes you might see pictures of a lady dressed in a British flag, holding a trident and a shield, and that's supposed to be Britannia too. So, basically - Britannia used to be the name for the island of Great Britain, and now it's more of a symbol of British history and identity.