Background
Ethnicity:
Hartmann's mother was Japanese and his father was German.
Sadakichi Hartmann was born on November 8, 1867 in Nagasaki, Japan. He was the son of Carl Herman Oskar Hartmann. Hartmann’s mother died in childbirth, and Hartmann and his older brother were sent to Hamburg, Germany. He was raised in the care of a wealthy uncle and a grandmother.