Ha Noi, Mar. 14 (VNA) - Artefacts found at the first ever large-scale excavation at a temple dedicated to An Duong Vuong King in the Co Loa Citadel in Ha Noi's outlying district of Dong Anh have testified to what is written in history books that the temple dates back to the Tran dynasty. That was the preliminary report of a team from the Viet Nam Institute of Archaeology (VIA) who have been digging at the site since January. Associate Professor Pham Minh Huyen, who led the five-member group, said on Mar. 9 that her team dug six holes at the site and found numerous valuable arterfacts, mainly ceramics, tiles, and bricks, distributed in three layers. Those in the top layer belong to the Le dynasty (15-18th century) and the recent past, while in the second top layer are artefacts of the Tran dynasty (13-14th century). In the bottom layer are the particular ceramics of the Co Loa area. The archaelogists also discovered remnants of kilns at the site, including an almost intact firing chamber with pieces of bricks and tiles in it. Earlier excavations on a small scale also unearthed vestiges of kilns of various sizes, proving the existence of a system of kilns serving construction at the site. All the findings help shed the light on the periods of cultural development in the area, as well as the importance of the An Duong Vuong Temple. A discovery that has sparked great interest was also made in association with a local legend regarding the temple, which is located in the inner compound of the citadel. Local people used to believe in the presence of a one-eyed dragon at the An Duong Vuong Temple, also called the Thuong (Upper) Temple. The dragon's mouth held a pearl, which is the Gieng Ngoc (the Pearl Well) facing the Thuong Temple. Its two eyes were two round and deep holes in front of the temple, and the hole on the right is always wet with water be it dry or wet season, corresponding to the dragon's intact eye, while the other is always dry. Digging into the wet hole, excavators found a spherical hollow block made of terracotta, which contained baked clay and many pieces of bricks and tiles. Under the block, they also discovered a thick layer of ash, under which was a layer of yellow clay with pieces of Co Loa ceramics. Associate Professor Pham Minh Huyen and Dr Nguyen Doan Tuan, Director of the Ha Noi Relic Sites and Landscape Management Board, have proposed that the city allow them to expand their excavation site by 140 sq. m. to search for more scientific evidence in order to help preserve and restore one of the country's important historical sites.