He made Beijing a secondary capital of the Ming empire , and construction began in 1406 of what would become the Forbidden City .
In 1402 , Zhu Di usurped the throne and became the Yongle Emperor .
Zhu Di made Beijing a secondary capital of the Ming empire , and construction began in 1406 of what would become the Forbidden City .
In 1402 , Zhu Di usurped the throne and became the Yongle Emperor .