An imperial mausoleum at Amidaiji-cho, Shimonoseki, Yamaguchi Prefecture, managed by the IHA as the tomb of Emperor Antoku, the 81st emperor. Shimonoseki City's newsletter says that after the Battle of Dan-no-ura, Emperor Antoku's body was buried at Amidaji, which became the mausoleum in the grounds of Akama Shrine.
Official status & archaeological view
Official status
Managed by the IHA as the mausoleum of Emperor Antoku, the 81st emperor; the official form is a round tumulus (enkyu).
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
The IHA visitor page does not give its archaeological size, construction date, or burial structure.
Field notes
About one minute on foot from Akama Jingu-mae bus stop; generally open 08:30–17:00. Follow current IHA guidance and on-site signs. The goryoin (mausoleum seal) is kept at the Momoyama Mausolea Office in Fushimi-ku, Kyoto, where visitors can use it free of charge (reception 8:30–17:00; staff may be unavailable on weekends, holidays, 29 Dec–3 Jan and some other days).