Erina is my best friend.

The culture of the Nara period played a very important role in Japanese history.

During the Ice Age, the climate of the Earth changed significantly.

He survived through the Dark Ages.

This piece of art reflects the zeitgeist of its time.

The Age of Enlightenment was a period when science and reason were emphasized.

The Yayoi period is a part of Japanese history.

The Asuka Period is a part of Japanese history, a time when culture and arts greatly developed.

The Ashikaga era is a part of Japanese history.

The Kamakura period was a very important time in Japanese history.