Alfred Thayer Mahan was a United States naval officer and historian, whom John Keegan called "the most important American strategist of the nineteenth century." Wikipedia
Born: September 27, 1840, West Point, NY
Died: December 1, 1914 (age 74 years), Washington, D.C.
Education: United States Naval Academy, Columbia University, and Saint James School
Descendants: Gabrielle Catherine Gräfin von Rietberg, Kathleen Hamilton Mahan, Alfred Thayer Mahan, and more
Grandchild: Kathleen Hamilton Mahan
Great grandchildren: Gabrielle Catherine Gräfin von Rietberg and Mark Andreas Graf von Rietberg