Omi Jingu

Omi Jingu is a Shinto shrine located in Otsu. The shrine enshrines Emperor Tenji (Tenji Tennō), the 38th emperor of Japan, who reigned in the 7th century and is known for significant political and administrative reforms.

Omi Jingu was established on 7 November 1940, with the approval of Emperor Shōwa, to commemorate the 2,600th anniversary of the traditional founding of Japan. It was designated a former kanpei-taisha (government-supported major shrine) and is one of sixteen shrines classified as imperial chokusai-sha, where an imperial envoy is dispatched for important festivals.

The shrine stands adjacent to the site traditionally identified as the location of Ōmi Ōtsu Palace, where Emperor Tenji transferred the capital in 667. Although the precise location of the palace was not confirmed at the time of the shrine’s construction, postwar archaeological research has supported the identification of the surrounding area as part of the ancient palace complex.

The movement to establish a shrine dedicated to Emperor Tenji began in the late 19th century, reflecting strong local reverence in Shiga Prefecture. After formal organisation in the 1930s and imperial approval, construction proceeded with widespread public support, and the enshrinement ceremony was held in 1940.

Emperor Tenji and His Legacy

Emperor Tenji (also known as Ame-no-Mikoto-Hirakasuwake no Ōkami as a deity) is remembered for initiating the Taika Reforms in 645 alongside Fujiwara no Kamatari, restructuring the political system and strengthening centralised governance. After relocating the capital to Omi, he introduced administrative codes, land and census reforms, and educational institutions.

He is also traditionally credited with introducing a water clock (clepsydra) to measure time officially. June 10, designated in modern Japan as “Time Memorial Day”, commemorates the beginning of timekeeping at the Ōmi court. In connection with this legacy, the shrine grounds include a Clock Museum displaying Japanese and Western timepieces, as well as reconstructed water clocks and sundials.

Because of these achievements, Emperor Tenji is venerated as a deity associated with guidance, good fortune, culture, scholarship, industry, and the measurement of time.

Architecture and Grounds

The shrine precinct covers approximately 60,000 tsubo (around 200,000 square meters). Its buildings, constructed in what is sometimes called Ōmi-zukuri or Shōwa-era shrine style, are arranged on a wooded hillside. The main sanctuary and worship halls are connected by covered corridors and are recognised as representative examples of modern shrine architecture. Since 1998, the complex has been registered as a National Tangible Cultural Property.

The approach to the shrine leads through large torii gates, a purification pavilion, and a vermilion two-story gate before arriving at the spacious outer worship hall. Within the precincts are several additional facilities, including a hall used for rituals, weddings, and cultural events such as karuta ceremonies; the Clock Museum and associated educational facilities; a remote worship hall relocated from a former imperial residence; and auxiliary buildings used for purification rites and other ceremonial functions.

The shrine is also closely associated with the classical poetry anthology Ogura Hyakunin Isshu. Emperor Tenji’s poem appears as the opening verse of the collection, and the shrine hosts karuta-related ceremonies and competitions, reflecting his role as a cultural patron in later tradition.