Hagner was married to Frances Randall (1787–1863), a daughter of
John Randall, a Revolutionary War veteran who was Collector of the Port of Annapolis and was thrice elected
Mayor of Annapolis. Among her many siblings were brothers
Alexander Randall, a
U.S. Representative and
Attorney General of Maryland, and Dr.
Richard Randall, the
colonial agent of the
American Colonization Society in
Liberia. Among their eleven children were: • Charles Nicholas Hagner (1809–1849), a Lieut. of the
Corps of Topographical Engineers who died at
Port Lavaca, Texas. • John Randall Hagner (1811–1856), of the Army Paymasters' Corp who married Louisa Smith and died at
Fort Brown, Texas. • Frances Randall Hagner (1813–1902), who died unmarried. •
Peter Valentine Hagner (1815–1893), who was an officer of ordnance who served for over 40 years in the United States Army and was brevetted Brigadier General. He married Susan Scott Peyton in 1853. • Thomas Holmes Hagner (1817–1848), a lawyer, member of the
Florida Legislature, and U.S. Minister to the
Court of St. James who married Katherine Gamble. • Mary Margaret Hagner (1818–1911), who married the Rev. Dr.
Cleland Kinloch Nelson, the first
Bishop of Atlanta and a cousin of
Thomas Nelson Page. • Richard Henry Hagner (1823–1904), a well-known lawyer of
Calvert County who married Annie Mary Hungerford. •
Alexander Burton Hagner (1826–1915), an Associate Justice of the
Supreme Court of the District of Columbia who married Louisa Harrison, a daughter of Randolph Harrison of
Elk Hill in 1853. He had a law practice with his uncle,
Alexander Randall. • Daniel Randall Hagner (1829–1893), a Washington physician. Hagner died in
Washington, D.C., on July 16, 1850.
Descendants Through his daughter Eliza, he was a grandfather of Mary Hagner Nicholson (1837–1865), the wife of
James Buchanan Henry, a lawyer who was the nephew and ward of
James Buchanan, for whom he served as
Secretary to the President of the United States. Through his son Daniel, he was a grandfather of
Belle Hagner (1875–1943), who was the first
White House Social Secretary, serving in the administrations of President
Theodore Roosevelt,
William Howard Taft, and
Woodrow Wilson. ==References==