Amaterasu in the context of "Wake no Kiyomaro"

The emperor of Japan is the hereditary monarch and head of state of Japan. The emperor is defined by the Constitution of Japan as the symbol of the Japanese state and the unity of the Japanese people, his position deriving from "the will of the people with whom resides sovereign power". The Imperial Household Law governs the line of imperial succession. Pursuant to his constitutional role as a national symbol, and in accordance with rulings by the Supreme Court of Japan, the emperor is personally immune from prosecution. By virtue of his position as the head of the Imperial House, the emperor is also recognized as the head of the Shinto religion, which holds him to be the direct descendant of the sun goddess Amaterasu. According to tradition, the office of emperor was created in the 7th century BC, but the first historically verifiable emperors appear around the 5th or 6th centuries AD.

The role of the emperor of Japan has historically alternated between a largely ceremonial symbolic role and that of an actual imperial ruler. Since the establishment of the first shogunate in 1192, the emperors of Japan have rarely taken on a role as supreme battlefield commander, unlike many Western monarchs. Japanese emperors have nearly always been controlled by external political forces, to varying degrees. Between 1192 and 1867, the shōguns, or their shikken regents in Kamakura (1203–1333), were the de facto rulers of Japan, although they were nominally appointed by the emperor. After the Meiji Restoration in 1868, the emperor was the embodiment of all sovereign power in the realm, as enshrined in the Meiji Constitution of 1889. Since the enactment of the 1947 constitution, the role of emperor has been relegated to that of a ceremonial head of state without even nominal political powers. The emperor is the head of the Japanese honors system, conferring orders, decorations, medals, and awards in the name of the state and on behalf of its people in accordance with the advice of the Cabinet.

Japanese mythology is a collection of traditional stories, folktales, and beliefs that emerged in the islands of the Japanese archipelago. Shinto traditions are the cornerstones of Japanese mythology. The history of thousands of years of contact with Chinese and various Indian myths (such as Buddhist and Hindu mythology) are also key influences in Japanese religious belief.

Japanese myths are tied to the topography of the archipelago as well as agriculturally-based folk religion, and the Shinto pantheon holds uncountable kami ("god(s)" or "spirits").

Kami (Japanese: 神; [kaꜜmi]) are the deities, divinities, spirits, mythological, spiritual, or natural phenomena that are venerated in the traditional Shinto religion of Japan. Kami can be elements of the landscape, forces of nature, beings and the qualities that these beings express, and/or the spirits of venerated dead people. Many kami are considered the ancient ancestors of entire clans (some ancestors became kami upon their death if they were able to embody the values and virtues of kami in life). Traditionally, great leaders like the Emperor could be or became kami.

In Shinto, kami are not separate from nature, but are of nature, possessing positive and negative, and good and evil characteristics. They are manifestations of musubi (結び), the interconnecting energy of the universe, and are considered exemplary of what humanity should strive towards. Kami are believed to be "hidden" from this world, and inhabit a complementary existence that mirrors our own: shinkai (神界; "the world of the kami"). To be in harmony with the awe-inspiring aspects of nature is to be conscious of kannagara no michi (随神の道 or 惟神の道; "the way of the kami").

Ninigi-no-Mikoto (Japanese: 瓊瓊杵尊) is a deity in Japanese mythology. (-no-Mikoto here is an honorific title applied to the names of Japanese gods; Ninigi is the specific god's name.) Grandson of the sun goddess Amaterasu, Ninigi is regarded according to Japanese mythology as the great-grandfather of Japan’s first emperor, Emperor Jimmu. The three sacred treasures brought with Ninigi from Heaven and divine ancestry established the Japanese Imperial Family.

The three generations of kami starting with Ninigi are sometimes referred to as the three generations of Hyūga, they are said to represent a transitional period between the heavenly kami and the first emperor.

Susanoo (スサノオ, Japanese pronunciation: [sɯ̥.sa.noꜜː]; historical orthography: スサノヲ, 'Susanowo'), often referred to by the honorific title Susanoo-no-Mikoto ([sɯ̥.sa.noꜜː no mʲi.ko.to]), is a kami in Japanese mythology. The younger brother of Amaterasu, goddess of the sun and mythical ancestress of the Japanese imperial line, he is a multifaceted deity with contradictory characteristics (both good and bad), being portrayed in various stories either as a wild, impetuous god associated with the sea and storms, as a heroic figure who killed a monstrous serpent, or as a local deity linked with the harvest and agriculture. Syncretic beliefs of the Gion cult that arose after the introduction of Buddhism to Japan also saw Susanoo becoming conflated with deities of pestilence and disease.

Susanoo, alongside Amaterasu and the earthly kami Ōkuninushi (also Ōnamuchi) – depicted as either Susanoo's son or scion depending on the source – is one of the central deities of the imperial Japanese mythological cycle recorded in the Kojiki (c. 712 CE) and the Nihon Shoki (720 CE). One of the gazetteer reports (Fudoki) commissioned by the imperial court during the same period these texts were written, that of Izumo Province (modern Shimane Prefecture) in western Japan, also contains a number of short legends concerning Susanoo or his children, suggesting a connection between the god and this region.

Izanagi (イザナギ/伊邪那岐/伊弉諾) or Izanaki (イザナキ), formally referred to with a divine honorific asIzanagi-no-Mikoto (伊邪那岐命/伊弉諾尊; meaning "He-who-invites" or the "Male-who-invites"), is the creator deity (kami) of both creation and life in Japanese mythology. He and his sister-wife Izanami are the last of the seven generations of primordial deities that manifested after the formation of heaven and earth. Izanagi and Izanami are held to be the creators of the Japanese archipelago and the progenitors of many deities, which include the sun goddess Amaterasu, the moon deity Tsukuyomi, and the storm god Susanoo. He is a god that can be said to be the beginning of the current Japanese imperial family.

The Ise Shrine (Japanese: 伊勢神宮, Hepburn: Ise Jingū), located in Ise, Mie Prefecture of Japan, is a Shinto shrine dedicated to the solar goddess Amaterasu Ōmikami and the grain goddess Toyouke-hime (Toyouke Omikami). Also known simply as Jingū (神宮), Ise Shrine is a shrine complex composed of many Shinto shrines centered on two main shrines, Naikū (内宮) and Gekū (外宮).

The Inner Shrine, Naikū (also officially known as "Kōtai Jingū"), is dedicated to the worship of Amaterasu and is located in the town of Uji-tachi, south of central Ise, where she is believed to dwell. The shrine buildings are made of solid cypress wood and use no nails but instead joined wood. The Outer Shrine, Gekū (also officially known as "Toyouke Daijingū"), is located about six kilometers from Naikū and dedicated to Toyouke-Ōmikami, the god of agriculture, rice harvest and industry. Besides Naikū and Gekū, there are an additional 123 Shinto shrines in Ise City and the surrounding areas, 91 of them connected to Naikū and 32 to Gekū.

Religion in Japan is manifested primarily in Shinto and in Buddhism, the two main faiths, which Japanese people often practice simultaneously. Syncretic combinations of both, known generally as shinbutsu-shūgō, are common; they represented Japan's dominant religion before the rise of State Shinto in the 19th century.