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

He devoted his youth to baseball.

The ruins of the Iron Age are an important clue to understanding the life of that era.

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

The Heian period was a time when Japanese culture developed greatly.

The Yayoi period is a part of Japanese history.

The Edo period in Japan was a time when culture and art greatly developed.

The ruins from the Kofun Period are important for a deep understanding of Japanese history.

The Ashikaga era is a part of Japanese history.

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