Tennōki(天皇記?), alternatively known as Sumera Mikoto no Fumi, is a historical text purported to have been written in 620 by Shōtoku Taishi and Soga no Umako. It is recorded in the Nihon Shoki, but no extant copies are known to exist.
During the Isshi Incident in 645, the residence of Soga no Emishi (a succssor of Soga no Umako) was burned down. The Nihon Shoki records that the Kokki burned along with the Tennōki, but only the Kokki was saved.