Mukai Tadakatsu, more generally known as Mukai Shōgen, was the Admiral of the fleet for the Shōgun Tokugawa Ieyasu during the beginning of the Edo period, in the early 17th century.
The residence of Mukai Shogen in Edo, 17th century screen.
San Juan Bautista was one of Japan's first Japanese-built Western-style sailing ships. She crossed the Pacific in 1614. She was of the Spanish galleon type, known in Japan as nanban-sen.
Mukai Shōgen Tadakatsu
…of Hasekura Tsunenaga to America and Europe in 1613, by giving his support to the mission and supplying his Chief Carpenter for the building of the San Juan Bautista. He is also reported by Richard Cocks, head of the English Factory in Hirado, to have discussed with him and William Adams an invasion of the Philippines…
The San Juan Bautista is represented in Claude Deruet's painting of Hasekura Tsunenaga in Rome in 1617, as a galleon with Hasekura's flag (red swastika on orange background) on the topmast.
Nicolás de Cardona, in his 1632 report submitted to the king of Spain, included a view of the bay and city of Acapulco, mentioning the presence of "a ship from Japan" (letter "D"), probably the San Juan Bautista (Gonoi, p53). Cardona was in Acapulco between the end of 1614 and March 21, 1615. The full legend reads: A. The ships of the expedition. B. The castle of San Diego. C. The town. D. A ship that has come from Japan. E. Los Manzanillos.
Replica of the San Juan Bautista, in Ishinomaki, Japan. (2002)