Futsunushi , also known as Iwainushi , is a warrior god in Japanese mythology. Also known under the epithet Katori Daimyōjin (香取大明神) after his shrine in northern Chiba Prefecture, Katori Jingū, he is often revered alongside Takemikazuchi, with whom he is closely associated. He is regarded as a legendary ancestor of the Mononobe clan, and like Takemikazuchi is one of the tutelary deities of the Fujiwara clan.

Kashima Shrine is a Shinto shrine located in Kashima, Ibaraki in the northern Kantō region of Japan. It is dedicated to Takemikazuchi-no-Ōkami (武甕槌大神), one of the patron deities of martial arts. Various dōjō of kenjutsu and kendō often display a hanging scroll emblazoned with the name "Takemikazuchi-no-Ōkami". Prior to World War II, the shrine was ranked as one of the three most important imperial shrines Jingū (神宮) in the Shinto hierarchy, along with Ise Grand Shrine and Katori Shrine. During the New Year period, from the first to the third of January, Kashima Shrine is visited by over 600,000 people from all over Japan. It is the second most visited shrine in Ibaraki prefecture for new year pilgrims.