At the site, archaeologists found layers of baked clay tiles and pillars made of clay and stone. Judging from the distance between the pillars, they said the structure, which bears features similar to the Thang Long Citadel in Hanoi, was of a sizeable scale.

Chief of the team, Trinh Hoang Hiep, believed that bricks used to build the complex’s foundation were of special types dating from the 2^nd to 10^th centuries.

At the same time, roof tiles found at the site were typical products of the Ly Dynasty.

Meanwhile, Dr Shimizu Shinichi from the Tokyo Culture Research Institute said he hoped the site would help experts gain a deeper insight into the architecture of the Ly Dynasty, and especially the research on the relics of the Thang Long Citadel.