The Nishimiyayama Kofun (tumulus) in Tatsuno, Hyōgo prefecture, was the tomb of a powerful chieftain of the region formerly known as Harima and is known for its wealth of excavated artifacts. In 2019 and 2020, an exchange of archaeological materials and resources between Kyoto National Museum and Tatsuno History and Culture Museum shed light on the existence of important materials in local storage and private collections. This exhibition features artifacts and documents that tell a new story of the tomb and the history of Harima during the age of ancient Japanese state formation in the latter part of the Kofun period (ca. 3rd-6th century).