Hugh Dudley Auchincloss Sr. (July 8, 1858 – April 21, 1913) was an American merchant and businessman who was prominent in New York society.
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Early life
Hugh Dudley Auchincloss Sr. was born on July 8, 1858, at his father's summer home in Newport, Rhode Island. He was a younger son of John Auchincloss (1810–1876) and Elizabeth (née Buck) Auchincloss (1816–1902). Among his seven siblings were Sarah Ann Auchincloss (wife of Sir James Coats, 1st Baronet), William Stuart Auchincloss, Edgar Stirling Auchincloss (who married Maria LaGrange Sloan), Frederic Lawton Auchincloss, and railroad executive John Winthrop Auchincloss (who married Joanna Hone Russell). His father was the senior member of John & Hugh Auchincloss. His first cousins included Hugh Auchincloss Brown, electrical engineer and advocate of the cataclysmic pole shift hypothesis.
His paternal grandparents were Ann Anthony (née Stuart) Auchincloss and Hugh Auchincloss, who emigrated from Paisley, Scotland in 1801 and became a merchant in 1805. His mother, a descendant of Massachusetts Bay Colony Gov. Thomas Dudley, was a daughter of Gurdon Buck and Susannah (née Manwaring) Buck who had a mansion in Liberty Street in Manhattan. His maternal uncle was Dr. Gurdon Buck. After preparing for college at the Collegiate Institute of Morris W. Lyon, Auchincloss graduated from Yale University in 1879.



