Iksan Ssangneung consists of two tombs arranged north to south. The larger one, with a bigger burial mound and stone chamber, is called Daewangneung ("Great King's Tomb"); the smaller one to the south is Sowangneung ("Lesser King's Tomb" or "Queen's Tomb"). Both are corridor-style stone chamber tombs in the late Baekje architectural style, and for a long time both were assumed to belong to King Mu and his queen — believed, in the traditional legend, to be Princess Seonhwa. That assumption was already baked in when the site was designated Historic Site No. 87 in 1963.
Excavations conducted from 2017 to 2019 strengthened the case that Daewangneung's occupant was indeed King Mu, the 30th ruler of Baekje. But as the Mireuksa entry above lays out, the 2009 gilt-bronze reliquary inscription confirmed that, at least at the time Mireuksa was founded (639), King Mu's queen was the daughter of Sataek Jeokdeok, a jwapyeong (senior court minister). Whether Princess Seonhwa actually existed, and whether she was ever a queen, remains a matter of ongoing scholarly debate. So who, exactly, is buried in Sowangneung? That question remains genuinely unresolved. If Mireuksa is where the temple's own relics debunked an old love story, Ssangneung is where the question mark left behind by that debunking is still hanging in the air. Set on a quiet hillside, these two burial mounds stand as a kind of symbol for Iksan's Baekje history more broadly — caught between a glamorous legend and cold archaeological evidence that hasn't fully resolved things either way.