According to Greek mythology, the Golden Age was a time when people enjoyed peace and prosperity.

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 Sengoku period is a part of Japanese history.

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

The Ashikaga era is a part of Japanese history.

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

The Muromachi period is a part of Japanese history, a time when many cultural changes occurred.

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

The Yayoi period is a part of Japanese history.