A priest of the True Word (Shingon) school in Japan, also known as the Supervisor of Priests Hino'o or the Great Teacher Doko.
He first studied the doctrine of the Dharma Characteristics school under (Hosso) Taiki of Daian-ji temple.
When Kobo, who was later to found the True Word school in Japan, returned from China to Japan, Jitsue became his disciple.
He helped establish Kongobu-ji temple on Mount Koya and, in 823, moved to To-ji temple in Kyoto.
Thereafter he founded Kanshin-ji temple at Hino'o in Kawachi Province.
He was regarded highly by the imperial court and revered as the foremost among Kobo's ten major disciples.
His works are The Orally Transmitted Teachings on Meditation on the Character h(hrepresents the vowel sound "q"),
The Teachings Orally Transmitted to [Hino'o]], and The Treatise on the Diamond Realm.