Under Nguyen Dynasty, Xa Tac Esplanade (in Hue Citadel) was the place to organize the worshipping ceremony dedicating to the Earth and Rice Spirits for the good harvest and peace. It was built in the 5th year of Gia Long reign (1806) at the west side of Imperial City (in Hue Citadel). Following the emperor’s order, all provinces of all over the country had to contribute good soil to build up this esplanade.