Why is Tran Temple in Nam Dinh so sacred?

TPO - Nam Dinh is a land of outstanding people, the birthplace of the Tran Dynasty - the most prosperous dynasty in Vietnam associated with the feat of 3 times repelling the Yuan - Mongol army. With the moral of "When drinking water, remember its source", the people of Thanh Nam built the Tran Temple complex to forever worship and commemorate the merits of 14 Tran Kings.

Hoang Manh Thang - Tien Phong

Source: https://tienphong.vn/vi-sao-den-tran-nam-dinh-lai-linh-thieng-den-vay-post1616171.tpo#:~:text=TPO%20-%20Nam%20%C4%90%E1%BB%8Bnh%20l%C3%A0%20v%C3%B9ng%20%C4%91%E1%BA%A5t%20%C4%91%E1%BB%8Ba,c%C3%B4ng%20lao%20c%E1%BB%A7a%2014%20v%E1%BB%8B%20vua%20nh%C3%A0%20Tr%E1%BA%A7n.