Part 5 of the series Tosa and the Sea: how the people of Kochi helped open and change Japan.

Our series so far has followed a chain of Tosa people and the sea. A castaway survived a lonely island. A fisherman boy crossed to America and came home with knowledge of the world. A painter wrote that knowledge down, and a young samurai named Sakamoto Ryoma turned it into a vision of a Japan built on ships and trade. This part of the story is about the man who turned that vision into one of the largest companies in the world. His name was Iwasaki Yataro, and he built Mitsubishi.

The statue of Iwasaki Yataro at his birthplace in Aki, Kochi

A Poor Boy From Aki

Iwasaki Yataro was born in 1835 in a small village near Aki, on the coast east of Kochi City. His family had once been samurai but had become poor, so poor that they had given up their samurai rank. Yataro grew up knowing hardship, but he was clever, hard working, and full of ambition. From an early age he wanted to rise above the life he was born into, and he was willing to study and work harder than anyone around him to do it.

The preserved birthplace of Iwasaki Yataro in Aki

The Boy Who Dreamed of Holding Japan

There is a famous story told at his birthplace. As a young man, Yataro is said to have arranged stones in the garden in the shape of a map of Japan, as a way of promising himself that one day he would hold the whole country in his hands. Whether the story is exactly true or not, it captures his spirit perfectly. The simple thatched house and quiet garden you can still visit today seem far too small for such a huge dream, which is exactly what makes standing there so moving.

Inside the simple birthplace where Iwasaki Yataro grew up

Ships, Trade, and the Tosa Domain

As a young man, Yataro went to work for the Tosa domain, handling its trade and business in places like Nagasaki and Osaka. This was the same world of ships, money, and foreign goods that Sakamoto Ryoma had helped open up with his trading and shipping group. Yataro was not a swordsman or a dreamer of revolution. He was a man of numbers, deals, and ships. While others fought to change Japan, he learned how to build and run a modern business, a skill that Japan would badly need in the new age.

A room in the Iwasaki Yataro birthplace, a window into rural Edo life

From a Small Trading Company to Mitsubishi

After the fall of the old government, the Tosa domain could no longer run its own businesses, and its trading operations were handed over to Yataro. He took this small trading company and, with great skill and daring, built it into a shipping business of his own. He named it Mitsubishi. He won important contracts to carry troops and goods for the new government, and his ships soon dominated the seas around Japan. From shipping, Mitsubishi grew into mining, shipbuilding, banking, and much more, becoming one of the giant companies that powered modern Japan.

The thatched roof of the Iwasaki Yataro birthplace in Aki

The Mark of Three Diamonds

You have almost certainly seen the Mitsubishi mark, the three red diamonds. Few people know that this famous logo has its roots right here in Tosa. It is said to combine the three stacked diamonds of the Iwasaki family crest with the three leaf design of the crest of the Yamauchi lords of Tosa. So every time you see a Mitsubishi car, ship, or building anywhere in the world, you are looking at a small piece of Kochi history.

The Pacific Ocean off Kochi, the sea that shaped Tosa traders

The Sea Connection

It is no accident that Mitsubishi began as a shipping company. Iwasaki Yataro was a child of the same Tosa coast that shaped this whole series. The Pacific that carried the castaway Chohei, the fisherman boy Manjiro, and the dreams of Sakamoto Ryoma also carried the first ships of Mitsubishi. In Yataro, the long relationship between the people of Kochi and the sea turned into a modern business empire that helped build the nation.

The quiet lane near the Iwasaki Yataro birthplace in Aki

Visiting the Birthplace

Yataro’s birthplace in Aki is beautifully preserved. You can see the modest thatched house, the family storehouse with its three diamond mark, and the garden with the stones said to form his map of Japan. It is a quiet and powerful place, where it is easy to feel the gap between a poor boy’s simple home and the world changing company he went on to build.

A Different Kind of Tosa Hero

Sakamoto Ryoma and Itagaki Taisuke are remembered for ideas and ideals. Iwasaki Yataro is remembered for something more practical: building things that last. He could be tough and was not always loved, as powerful businessmen rarely are. But he showed that a poor boy from a small village in Kochi could compete with the world and win. In a country trying to stand on its own feet in a new age, that lesson mattered enormously. His company is still one of the most famous names on earth, and it all began on this quiet stretch of the Tosa coast.

A Note for Cruise Passengers

The Iwasaki Yataro birthplace is in Aki, on the coast east of Kochi City, around an hour from the Kochi cruise terminal. It pairs well with other historic sites in the east of the prefecture, such as the Doi Kachu samurai district and the Ekingura art museum. If you enjoy history and quiet, real places, I am happy to plan a day around them. I will pick you up from the cruise terminal, and transportation is included as part of the guided tour.

See the Historic Town Tour →

The Full Series: Tosa and the Sea

This is part of a five part series about the people of Kochi, the old land of Tosa, who helped connect Japan to the world and change its future.