The Mongol Empire reached its peak in the 13th century, and its territory extended from Europe to Asia.

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

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

The Imperial Valley is a beautiful place in California.

The Korean Empire was a nation that existed from 1897 to 1910.

The Russian Empire was a nation that existed from 1721 to 1917.

The Central African Empire was historically important.

His grandfather was a member of the Imperial Navy during World War II.

When he was young, he belonged to the Imperial Army.

The Imperial Diet was the legislative body of Japan.