Philip St. George Cooke
Philip St. George Cooke was a career United States Army cavalry officer who served as a Union General in the American Civil War. He is noted for his authorship of an Army cavalry manual, and is sometimes called the Father of the U.S. Cavalry. His service in the Civil War was significant, but was eclipsed in prominence by the contributions made by his famous son in law, J.E.B. Stuart, to the Confederate States Army.
Cooke was born in Leesburg, Virginia, June 13, 1809. He graduated from the United States Military Academy in 1827 and was commissioned a brevet second lieutenant in the infantry. He served at a variety of installations in the American West and in the Black Hawk War. In 1833 he was promoted to first lieutenant in the newly formed 1st U.S. Dragoons.
Source: Wikipedia