Daniel Harvey Hill
Dix was born on November 1, 1827 in New York City. He was the son of Catherine Morgan, the adopted daughter of Congressman John J. Morgan (1770-1849), and Major General John Adams Dix (1798-1879), U.S. Senator from New York (from 1845–1849), Secretary of the Treasury (from January–March 1861), Governor of New York (from 1873–1874) and Union major general during the Civil War. His father was notable for arresting six members of the pro-Southern Maryland legislature, preventing that divided border state from seceding, and for arranging a system for prisoner exchange via the Dix–Hill Cartel, concluded in partnership with Confederate Major General Daniel Harvey Hill.