Shaw's parents were Louis Agassiz Shaw Sr. and Mary Elizabeth Saltonstall. Both parents came from wealthy and politically influential
Boston Brahmin families with roots extending back to the
Mayflower. The couple's elder son was Quincy Adams Shaw III (born May 21, 1885). Louis Sr. died at home in Chestnut Hill from
tuberculosis when Louis Jr. was only four years old on July 2, 1891. Shaw's father was born at 26 Mount Vernon Street in
Beacon Hill in 1861, and the following year the family moved to
Jamaica Plain. He attended
George Washington Copp Noble School in
Boston, and graduated from Harvard University in 1884. He married Mary Elizabeth Saltonstall on June 30, 1884, in
Newton, right after the graduation ceremony. Shaw's uncle
Robert Gould Shaw II was the first husband of
Nancy Witcher Langhorne. She later married
Waldorf Astor, the eldest son of
William Waldorf Astor and Mary Dahlgren Paul of the
Astor family. Shaw's paternal grandparents were
Quincy Adams Shaw (one of the richest men in
Massachusetts through his investment in the
Calumet and Hecla Mining Company) and
Pauline Agassiz. == Education ==