Thread:NewGenTV/@comment-1746153-20141030143604/@comment-1359322-20141228131946

Where was it mentioned that it was 400 years ago. You can check the link given by Kia above. The page before that clearly mentioned 1000 years.

You are getting confused between the Teigu and Shingu. =___=

The Teigu was created 1000 years ago, while the Shingu was created 400 years back.