Sensō-ji traces its foundation to a legend set in 628, when the brothers Hinokuma Hamanari and Hinokuma Takenari found a small image of Kannon, the bodhisattva of compassion, in the Sumida River. According to temple tradition, the local headman Haji no Nakatomo recognized the image’s sacred character and converted his house into a place of worship. A Buddhist priest named Shōkai later built a hall for the image in 645. Although the earliest history cannot be reconstructed in every detail, the tradition established Sensō-ji as Tokyo’s oldest Buddhist temple.

The temple grew with the settlement of Asakusa, an area positioned near river traffic and routes entering the eastern side of the city later called Edo. Worshippers came to seek Kannon’s protection, and shops, lodging houses, theaters, and entertainment districts developed around the approach. Tokugawa Ieyasu, who established his shogunate at Edo in 1603, recognized Sensō-ji as a temple associated with prayers for the ruling house. Patronage from warriors and townspeople helped make it one of the most important religious centers in the expanding metropolis.

Sensō-ji’s precinct linked formal worship with popular urban culture. Visitors entered through the Kaminarimon, or Thunder Gate, proceeded along the shop-lined Nakamise approach, and passed the Hōzōmon before reaching the main hall. Festivals and markets drew large crowds. The neighboring Asakusa Shrine honors the figures associated with the discovery of the Kannon image and is the focus of the Sanja Matsuri, one of Tokyo’s largest traditional festivals. The relationship between temple, shrine, commerce, and entertainment illustrates the overlapping religious and social life of early modern Japan.

Fire repeatedly damaged the complex, as it did much of wooden Edo. Tokugawa Iemitsu sponsored major rebuilding in the seventeenth century, including a main hall that survived for centuries. The Great Kantō earthquake of 1923 devastated surrounding districts, but important temple buildings remained standing and the precinct became a place of refuge. American air raids on Tokyo in March 1945 destroyed the main hall and much of the complex. Reconstruction after the war became a public symbol of recovery. The present main hall was completed in 1958, and the Kaminarimon was rebuilt in 1960.

The principal buildings are therefore modern reconstructions, but the sacred tradition, spatial arrangement, rituals, and relationship with Asakusa have continued across centuries. The Kannon image itself is treated as a hidden icon and is not ordinarily displayed. Sensō-ji remains an active temple rather than a preserved ruin. Its historical importance comes from this continuity: a riverbank foundation legend became the center of a pilgrimage economy, a landmark of Edo popular culture, and a place through which modern Tokyo remembers destruction, reconstruction, and enduring religious practice.