Emperor Jimmu in the context of "Order of the Golden Kite"

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.

The era after the enthronement of Emperor Jimmu (神武天皇即位紀元, Jinmu-tennō sokui kigen), colloquially known as the Japanese imperial year (皇紀, kōki) or "national calendar year" is a unique calendar system in Japan. It is based on the legendary foundation of Japan by Emperor Jimmu in 660 BC. Kōki emphasizes the long history of Japan and the Imperial dynasty.The Gregorian year 2025 is Kōki 2685 (皇紀二千六百八十五年).

Kokkashugi (国家主義) was the ruling ideology of the Empire of Japan, particularly during the first decades of the Shōwa era. It is sometimes also referred to as Emperor-system fascism (天皇制ファシズム, Tennōsei fashizumu), Japanese-style fascism (日本型ファシズム, Nihongata fashizumu) or Shōwa Statism. Developed over time following the Meiji Restoration, Kokkashugi incorporated ultranationalism, traditionalist conservatism, militarist imperialism, and a dirigisme-based economy.

Yamato Sanzan (大和三山) or "the three mountains of Yamato", in Kashihara, Nara Prefecture, Japan, are Mount Amanokagu (香具山), Mount Unebi (畝傍山), and Mount Miminashi (耳成山). Celebrated in Japanese poetry, they have been jointly designated a Place of Scenic Beauty. Jimmu, first Emperor of Japan, is said to have built his palace on the southeast side of Mt Unebi; he is enshrined at Kashihara Jingū. Archaeological study in the 1990s has shown that, rather than their surrounding Fujiwara-kyō on three sides, the "palace-city" was so large as to encompass the three mountains.

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  Mt Kagu (152.4 m) 34°29′43.5″N 135°49′05.5″E / 34.495417°N 135.818194°E / 34.495417; 135.818194
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  Mt Unebi (199.2 m) 34°29′32.5″N 135°47′06″E / 34.492361°N 135.78500°E / 34.492361; 135.78500
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  Mt Miminashi (139.7 m) 34°30′53″N 135°48′20″E / 34.51472°N 135.80556°E / 34.51472; 135.80556

The following is a family tree of the emperors of Japan, from the legendary Emperor Jimmu to the present monarch, Naruhito.

Modern scholars have come to question the existence of at least the first nine emperors; Kōgen's descendant, Emperor Sujin (98 BC – 30 BC?), is the first for whom many agree that he might have actually existed. These monarchs are regarded by historians as "legendary emperors", since there is insufficient material available for further verification and study.