Kaison HITACHIBO (the date of birth and death unknown) is a legendary person whose name appears in "Genpei Seisui ki" (Rise and Fall of the Minamoto and the Taira clans), "Gikeiki" (a military epic about the life of Yoshitsune), and "Heike Monogatari" (The tale of the Heike), and is said to be a Buddhist priest at the Onjo-ji Temple or Mt. Hiei.
常陸坊海尊（ひたちぼうかいそん、生没年未詳）は、『源平盛衰記』、『義経記』、『平家物語』にその名が見える伝説の人物で、園城寺または比叡山の僧であったとされる。