Emperor Huizong of Song
"Aak" was brought to Korea in 1116 through a large gift of 428 musical instruments as well as 572 costumes and ritual dance objects from China, a gift to Emperor Yejong of Goryeo from Emperor Huizong of Song. It remained very popular for a time (there were originally no fewer than 456 different melodies in use) before dying out. It was revived in 1430, based on a reconstruction of older melodies, and preserved in "Treatise on Ceremonial Music" ("Aak Po"), a chapter of the Sejong Annals.