Yamasa Soy Sauce Co., Ltd.

In 1852 (Kaeng 5), he opened a "training hall" in Hiromura, exploring Western civilization and fostering youth talent.

In the late Edo period, he interacted with the Dutch medicine practitioner Miyake Genzai, who was operating in Choshi, and, interested in the West, Goryo opened a "training hall" in Hiromura in 1852 (Kaeng 5).

In 1853 (Kaeng 6), after inheriting the family headship, Goryo, who protected the family business amid the turbulence of the late Edo period, succeeded the 7th generation Hamaguchi Gibei.

About 200 years after founding, in 1853 (Kaeng 6), Goryo, the grandson of the 5th generation Kanpo, succeeded the 7th generation Hamaguchi Gibei.

On November 4 and 5, 1854 (Ansei 1), during the Great Nankai earthquake, Goryo, who was returning to his hometown of Kii, Hiromura, anticipated a tsunami and lit fires on rice bundles to warn villagers, saving lives.

On November 4, 1854 (the first year of the Ansei era), in anticipation of the Great Nankai earthquake, Goryō lit fires in the rice fields to warn villagers of the impending tsunami, saving many lives.

On November 5, 1854 (the first year of the Ansei era), in anticipation of the Great Nankai earthquake, Goryō lit fires in the rice fields to warn villagers of the impending tsunami, saving many lives.

From 1855 (Ansei 2) for four years, he spent 94 koku of silver to advance the construction of a levee to protect against tsunamis.

To prevent future tsunami damage, from 1855 (the second year of the Ansei era) for four years, 94 koku of silver was spent to build a levee. The 600‑meter long, 5‑meter high embankment, planted with pine on the sea side and hazel on the land side, still preserves its scenery and is designated as a historic site.

In 1858 (Ansei 5), when a smallpox inoculation site in Edo burned, he donated funds for its reconstruction.

When the smallpox inoculation site in Kanda O-tama-gai-ike in Edo burned, he donated 300 ryō for reconstruction. Additionally, according to the Goryo transmission, he donated another 400 ryō for books and machinery, and the site later became the only Western medical research institute in Edo, called the Western Medical Institute.

In 1858 (the fifth year of the Ansei era), a smallpox clinic in Edo (Kanda O-tama-ga-ike) was destroyed by fire. A donation of 300 ryō was made for reconstruction, and an additional 400 ryō was donated for books and equipment. The clinic later became known as a Western medical institute and became Edo’s only Western medical research institute.

In 1858 (the fifth year of the Ansei era), a smallpox clinic in Edo (Kanda O-tama-ga-ike) was destroyed by fire. A donation of 300 ryō was made for reconstruction, and according to the account of Hamaguchi Goryō, an additional 400 ryō was donated for books and equipment. The clinic later became known as a Western medical institute and became Edo’s only Western medical research institute. (It forms the basis of the current University of Tokyo School of Medicine.)

In 1864 (Genji 1), Yamasa Soy Sauce received the title of "Sōjō soy sauce" from the shogunate.

During Goryo's era, Yamasa Soy Sauce was recognized by the shogunate as a particularly high-quality soy sauce and received the title of "Sōjō soy sauce."

In 1864 (the first year of the Genji era), Yamasa soy sauce was recognized by the shogunate as a particularly high‑quality soy sauce, earning the title of “Sōjō” during the Goryō era.