The tomb of concubine Sio Hala from the Liao Dynasty (916 to 1125), one of 10 important archaeological discoveries made in 2015, is located in Duolun County of Xilingol League, Inner Mongolia. A large selection of porcelain has been unearthed from the tomb after two consecutive years of excavation.

The discovery of the tomb came about because of an illegal tomb raid. A total of 100 cultural relics were reclaimed thanks to the efforts of the Public Security Bureau and Cultural Relics Department of Duolun County.

Gai Zhiyong, deputy director of the Institute of Cultural Relics and Archaeology of Inner Mongolia, explained that Sio Hala's tomb is the first such Liao Dynasty concubine tomb to be excavated in China, lending it critical importance to general research of the Liao Dynasty.

In addition to the porcelain, an inscribed box was also unearthed, with a seal script carved into the cover. Research of the seal indicates that it belonged to the first empress of Yelü Longxu, Liao Shengzong, who was demoted to the role of concubine due to conflict within the royal family.