It is written in "The Nihonshoki" (Chronicles of Japan) that in 667, Ryujingan, who was the Tang general stationed in Kudara, ordered the Ungjin governor-general capital (one of the 5 governor-general offices created by the Tang Dynasty in Kudara after the occupation) to send the Japanese hostages to the Chikushi governor-general capital.
『日本書紀』の667年には、唐の百済鎮将劉仁願が、熊津都督府（唐が百済を占領後に置いた5都督府のひとつ）の役人に命じて、日本側の捕虜を筑紫都督府に送ってきたという記載がある（「十一月丁巳朔乙丑百濟鎭將劉仁願遣熊津都督府熊山縣令上柱國司馬法聰等送大山下境部連石積等於筑紫都督府」）。