| Location | Sakai, Osaka |
|---|---|
| Shape | Keyhole-shaped mound |
| Mound length | 100 m |
| Period | 5th c. |
| World Heritage | Mozu-Furuichi Kofun Group (UNESCO) |
A 100m keyhole-shaped satellite mound northeast of Daisen Kofun. Among the Mozu group's satellite tombs, this is one of the largest. The three-tiered mound with moat represents a typical large-scale satellite of the 5th century. The satellite tomb system (baicho) developed around the great royal mounds of the 5th century, and more than a dozen satellite mounds are documented across the Mozu and Furuichi groups combined.Constituent monument of the "Mozu-Furuichi Kofun Group" UNESCO World Heritage Site (2019). Managed separately from the main Daisen Kofun enclosure as a "detached" IHA site. The satellite tomb system (baicho) is attested across ancient East Asia and concentrates around the great Japanese royal mounds of the 5th century. The presence of satellite tombs reflects both the power of the great kings and the ancient belief that close attendants should rest beside their lord in death. The name "Nagayama" (Long Hill) is an old place name in the area and may relate to the mound's elongated hillock profile.
No excavation permitted under IHA mausoleum regulations. Internal structure and grave goods remain unknown. Exterior viewable from public paths.