St. Nguyen Temple, also known as Duc Thanh Nguyen Temple, is located in the ancient Diem village (now belonging to Gia Thang and Gia Tien communes, Gia Vien district, Ninh Binh province). The relic lies within the land of the ancient capital Hoa Lu, about 15km northwest of Ninh Binh city center, easily accessible via National Highway 1A or the Hoang Long River waterways.
This relic site was built on the foundation of Vien Quang Tu Pagoda – an ancient pagoda founded by Saint Nguyen Minh Khong himself in 1121. After his passing, the local people converted the pagoda into a temple to worship him as a guardian deity. St. Nguyen Temple was recognized as a national historical and cultural relic in 1989, featuring ancient architecture with items such as the triple gate, front hall, sanctuary, and a large festival courtyard. This place is not only a sacred place of worship but also a vivid testament to the history of Vietnamese Buddhism and traditional medicine.



