Among investigations of ancient sites made by Japanese scholars in the Korean Peninsula during the past forty yeas, there are some which have attracted the attention of scholars of the world. One of these was the excavation of the Lo-lang sites of the Han dynasty centering about Heijōᵃ (P'ing-jang); the other was the discovery of the Kao-kou-li tombs with wall paintings in the neighborhood of Heijō and in the vicinity of T'ung-kou, Chi-an shêng,ᵇ Manchuria, in the north.
Source: wiktionary