ancient times

The title "Zi" was an honorific title for learned scholars in ancient China, such as Confucius, Laozi, Mozi and Han Feizi.

I wish I could see the ancient world.

Rome is famous for its ancient architecture.

The custom of eating dumplings on New Year's Eve is related to an ancient Chinese method of measuring time; in ancient China, each day was divided into twelve sections: the beginning of each day was called 'first time', which corresponds to the period from 11pm to 1am.

Early explorers used the stars for navigation.