Little is known of the life of Laozi ,
the recorded author of the Doo De Jing,
the major work of Daoist philosophy .
According to one ancient historian who lived four centuries after Laozi is said to have died,
Laozi had served as the official historian for a powerful noble.
The same historian recorded that Laozi once met Confucius,
who was younger than Laozi and quite pleased to meet the older philosopher.