Okay kiddo, so a long, long time ago there was a place called the Principality of Polotsk. It was a bit like a kingdom, but smaller, and it was ruled by a person called a Prince.
Polotsk was in what is now Belarus, which is a country in Europe. People lived there and did things like grow crops and make things with their hands.
The Principality of Polotsk was around for hundreds of years, from the 9th century to the 13th century. It was an important place for trade and commerce, and people would trade things like furs, honey, and wax.
Over time, the Principality of Polotsk became part of bigger empires, like the Russian Empire. But it still had a rich and important history, and people still remember it today. Some people even visit the area to see the old buildings and learn about the people who lived there so long ago.