The Byzantine Empire, also known as the Eastern Roman Empire, was a powerful empire with a long history.

The Byzantine Empire is a state that developed from the eastern part of the Roman Empire.

Mr. Umakoshi is my best friend.

He was looking at the snowy scenery through the window.

I saw it snowing through the window.

During the Qing dynasty, culture and science developed greatly.

I have visited 10 countries so far.

The United Mexican States is a country located in North America.

The Kingdom of Burgundy was an important kingdom in medieval Europe.

The Duchy of Burgundy was one of the most powerful territories in medieval Europe.