The Ho Dynasty Citadel (Photo: VNA)

For the main palace and the eastern part of the citadel in different historical periods, the artifacts will serve study purposes and restoration projects at the relic site, affirming its major and exceptional value.

The large-scale excavation was carried out in two digs located in the central part of the citadel, spanning 8,000 sq m.

Four traces of architecture from the Ho Dynasty (1400-1407) were discovered, along with two others dating back to the Le Dynasty spanning the period from the 15th century to the 17th century.

Bricks decorated with flower patterns produced in the Ly Dynasty (1009-1226) and the Tran Dynasty (1226-1400) were also discovered, as were some created in the citadel and bearing ancient characters.

The artifacts enable scientists and archaeologists for the first time to clearly envisage the different architectural styles of the citadel.

Built in 1397 under the Ho Dynasty as the capital of Dai Ngu, the citadel is unique for its outstanding construction technique which used large blocks of stone, weighing from 10 tonnes to 26 tonnes each, carefully shaped, interlocked and elevated to an altitude of about 10 meters.