Tōsen-ji Temple

Overview

Tōsen-ji (東泉寺) is a Buddhist temple in Katsushika, a ward in the east of Tokyo. It is also known by the name 南蔵院 (Nanzōin), which is the name recorded for the temple in historical records. The temple was founded in 1348, during the Muromachi period (1336–1573), making it one of the older religious sites in the area.

The temple is closely associated with the "Bound Jizo" — a statue of the bodhisattva Jizō that features in a well-known Edo-period legal case. The case was adjudicated by Ōoka Tadasuke, a magistrate who served in Edo (present-day Tokyo) and who became one of the most famous judges in Japanese history. The temple's connection to this case is the main reason it is known today.

The temple is located in Higashi-Mizumoto, a neighbourhood in Katsushika. It stands near the Yamamoto House and Mizumoto City Park.

History

Tōsen-ji was founded in 1348. In the Japanese era system, that year falls in Shōhei 3 (正平三年), during the Muromachi period. The Muromachi period takes its name from the Muromachi district of Kyoto, where the Ashikaga shoguns established their government. It was an era of significant temple construction across Japan, and Tōsen-ji belongs to that wave of religious foundation.

The temple's enduring fame, however, comes from a much later period — the Edo period (1603–1868). During that time, the temple was the site of a Jizō statue that became the subject of a legal dispute. The case was brought before Ōoka Tadasuke, a magistrate known for his shrewd and often unconventional judgments. The "Bound Jizo" case became one of the most frequently retold stories associated with him.

The case is known in Japanese as the Case of the Bound Jizo (縛られ地蔵の裁判). The story involves a statue of Jizō that was found bound with rope. The details of the dispute and Ōoka's ruling have been passed down as a famous example of his judicial reasoning. The temple's association with this case gave it a lasting place in Edo-period legal lore.

What Stands There Today

The temple remains an active Buddhist temple in Katsushika. Its grounds are located in Higashi-Mizumoto, a residential area in the eastern part of Tokyo. The temple is situated near the Yamamoto House and Mizumoto City Park, both of which are local landmarks in the neighbourhood.

The temple is known for its connection to the Bound Jizo, and the story of the case continues to be told in connection with the site. The temple's name, Tōsen-ji, and its alternate name, Nanzōin, are both used in reference to the site.

The Name in Japanese

The temple's name in Japanese is 南蔵院. Its reading in kana is なんぞういん, and its romaji is Nanzōin. The name is also written as 東泉寺 (Tōsen-ji), which is the name by which the temple is commonly known.

Breaking down 南蔵院 character by character:

• 南 — read here as nan. The character means "south." It is a common element in Japanese place names and temple names, often indicating a southern location or a direction associated with the site.
• 蔵 — read here as zō. The character means "storehouse," "repository," or "treasury." In temple names, it often carries the sense of a place where something precious is kept — whether teachings, relics, or images.
• 院 — read here as in. The character means "institution," "temple," or "cloister." It is a standard suffix for Buddhist temple names in Japanese, and it appears in the names of many temples across the country.

Together, 南蔵院 (Nanzōin) can be understood as "South Storehouse Temple" or "Southern Repository Cloister." The name follows a common pattern in Japanese temple naming, where each character contributes a distinct element — a direction, a function, and an institutional designation.

The alternate name 東泉寺 (Tōsen-ji) breaks down as follows:

• 東 — read here as tō. The character means "east."
• 泉 — read here as sen. The character means "spring" or "fountain."
• 寺 — read here as ji. The character means "temple."

So 東泉寺 (Tōsen-ji) means "East Spring Temple." The two names — 南蔵院 and 東泉寺 — are both attested for this temple, with 南蔵院 being the name recorded in the source material and 東泉寺 being the name by which the temple is commonly known.

Visiting and Context

Tōsen-ji is located in Higashi-Mizumoto, Katsushika, in eastern Tokyo. The area is served by local rail and bus lines, and the temple is within walking distance of Mizumoto City Park. The neighbourhood is residential, and the temple sits among ordinary streets rather than in a tourist district.

For visitors interested in Edo-period history, the temple's main draw is its connection to the Bound Jizo case and to Ōoka Tadasuke. Ōoka served as a magistrate in Edo and became a legendary figure in Japanese popular culture, appearing in countless stories, plays, and television dramas. The Bound Jizo case is one of the most famous episodes attributed to him.

The temple's founding in 1348 places it within the Muromachi period, a time when Buddhist institutions across Japan were expanding and consolidating. The temple's survival into the present day, and its continued association with a famous legal case, make it a site where several layers of Japanese history intersect — medieval religious foundation, early modern law and storytelling, and modern urban Tokyo.