Kofun is the Japanese name for a tumulus, which is an ancient massive mound that was constructed with countless layers of dirt, in which people of rank or power were buried when they passed away. These tombs on Iki were constructed from the 6th to the 7th centuries and make up 60% of those found in Nagasaki Prefecture. Literature from the 17th- to the 19th-century Edo period recorded 340 kofun on the island, but only 280 of them remain today. Of these, the nationally designated Historic Site of