Clateau was a French non-commissioned officer of the 19th century, a quarter-master and a cannonry specialist.

With the advent of the Boshin War

Boshin War

The was a civil war in Japan, fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and those seeking to return political power to the imperial court....

, and the declaration of neutrality of foreign powers, Clateau chose to resign from the French Army and continue the fight on the side of the Bakufu.

He participated to the Naval Battle of Miyako, in which he was in charge of the cannonry on board the steam warship Banryū

Japanese warship Banryu

The Japanese warship was a ship of the Bakufu Navy, and subsequently belonged to the troops loyal to the Shogun during the Boshin War in Japan in 1868. Banryū was originally built in England as a schooner, where she had been named Emperor. She had a length of 41.8 meters, a breadth of 5.45 meters,...

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After the conflict, Clateau set up a Hotel-Restaurant in the area of Tsukiji

Tsukiji

Tsukiji is a district of Chūō, Tokyo, Japan, the site of the Tsukiji fish market. Literally meaning "reclaimed land," it lies near the Sumida River on land reclaimed from Tokyo Bay in the 18th century, during the Edo period....

 in Tokyo

Tokyo

, ; officially , is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family...

, and a second one in Yokohama

Yokohama

is the capital city of Kanagawa Prefecture and the second largest city in Japan by population after Tokyo and most populous municipality of Japan. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu...

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