Tsuda was born into a local
samurai household in
Tsuyama Domain (present-day
Okayama Prefecture). In his early days, he studied
rangaku under Mitsukuri Gempo and military science under
Sakuma Shozan. He became an instructor at the
Bansho Shirabesho institute run by the
Tokugawa bakufu to study western books and science. In 1862, he was selected, together with
Nishi Amane, by the government for training in the
Netherlands in western
political science,
constitutional law, and
economics. They departed in 1863 with a Dutch physician Dr.
J. L. C. Pompe van Meerdervoort, who had set up the first teaching hospital for
western medicine in
Nagasaki. The two Japanese students were put in the care of Professor
Simon Vissering, who taught Political Economy, Statistics and Diplomatic History at the
University of Leyden. They developed a genuine friendship with Vissering who was conscious of the long-standing friendship between Japan and the Netherlands through
Dejima. He felt that the students' desire for knowledge would make them likely future participation in Japan's modernization. Vissering, a member of
La Vertu Lodge No, 7,
Leyden introduced them to
Freemasonry, of which they became the first Japanese adherents on 20 October 1864. ==Government career==