C82
Tianjin was a place Emperor Yongle had to pass through to get to the south.
From the attack in Yan Jing City all those years ago to the Shuntian Palace, the road that the Emperor Yongle had chosen was the one that the current Emperor had walked. To the south, they had to pass the city that Emperor Yongle had changed his name to Tianjin.
Tianjin