A 2,200-year-old ornate tomb in eastern China may belong to the ruler of the Chu state, one of the seven powerful kingdoms that vied for supremacy during China’s formative Warring States period, an expert told Live Science.

The tomb is the largest and most complex ever found from the Chu state and would shed more light on the conditions of the time, according to officials with China’s National Cultural Heritage Administration (NCHA) who were quoted by the official state news agency Xinhua.

Archaeologists have spent the past four years excavating the tomb at Wuwangdun, which is located near the city of Huainan in China’s Anhui province. According to Xinhua, archaeologists have unearthed more than 1,000 cultural relics at the site — including lacquered artifacts, bronze ritual vessels and musical instruments — as well as a central coffin inscribed with more than 1,000 written characters. Radiocarbon dating and other analyses suggest the tomb dates to the late stage of the Chu state in about 220 B.C., when it was coming under the influence of the Qin state.

Qin was ultimately the victor among the seven Warring States that followed China’s royal Zhou dynasty — Qin, Han, Wei, Zhao, Qi, Chu and Yan — and its subsequent unification of the country is officially regarded as the beginning of modern China. The tomb’s date corresponds to a critical period before the feudal Chu system disintegrated, Xicheng Gong, an archaeologist with the Anhui Provincial Cultural Relics and Archaeology Institute who’s leading the excavations, told Xinhua.

“The findings can provide an overall picture of the political, economic, cultural, technological and social conditions of the Chu state,” Gong said, adding that they could also improve archaeologists’ understanding of Chu’s evolution into part of a unified China. Zhiguo Zhang, a researcher involved in the excavations at China’s National Center for Archaeology (part of the NCHA), said the archaeologists worked within a special low-oxygen laboratory built at the site to preserve the unearthed relics.

In addition to traditional recording measures, the team used digital scanning, surveying and mapping to create a precise 3D model of the tomb’s layer, he said, while the characters written on the coffin’s lid were recorded with infrared imaging technology. He said the team has excavated only one-third of the tomb and has not yet determined who was buried there.

“The excavation and protection work at the Wuwangdun tomb will be carried out simultaneously, and various scientific and technological measures will be used so that the archaeological value of the tomb will be clearly and comprehensively presented,” he told Xinhua.