Major Elvin Ragnvald Heiberg I (April 12, 1873 – March 2, 1917), served as the governor of Cotabato on Mindanao island in the Philippines.

[1][2] He was born on April 12, 1873, in Minnesota to John Peter Heiberg (1829-1908) and Marie Dorethe Gronn (1846-1929).

Heiberg was appointed to the United States Military Academy from Wisconsin in 1892 and graduated 40th in his class, in 1896.

[3] Heiberg died on March 2, 1917, at the Austro-Italian front during World War I when his horse was frightened and reared.

[4] The story attached to his wife's journal letters says that he was accidentally killed while "demonstrating a dismount-at-full-gallop from a horse to a gathering of nobility and diplomats.