William Knapp Thorn

William Knapp Thorn, Jr. (1848 – November 16, 1910) was an American champion polo player and the grandson of Commodore Cornelius Vanderbilt. Also, he was a hunter and horse-rider. He was one of the best-known sportsmen in the United States and France.

He was born in 1848 to Emily Almira Vanderbilt Thorn.

He participated in the 1886 International Polo Cup with teammates Foxhall Parker Keene and Thomas Hitchcock, Sr.

He died in Pau, France on November 16, 1910.

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