Frederik Hartvig Johan Heidmann was born in
Skogn in
Nord-Trøndelag (in the present-day
Levanger Municipality,
Trøndelag) in Norway. He was the son of Lorentz Peter Heidmann (1732–1807) and Dorothea Mathea Sommerschield (1740–1805). He was born into an officer's family. His father was a Major in the Trondheim Infantry Regiment (
Trondhjemske Infanterriregiment). He was trained for the military and in 1795 was promoted to second lieutenant. In 1803 he was promoted to first lieutenant with the Trondhjemske dragonkorps at
Trondheim. Together with
Petter Johnsen Ertzgaard, he represented the Trondhjem Dragon Corps (
Trondhjems dragonkorps) at the
Norwegian Constituent Assembly at
Eidsvoll Manor in 1814. He supported the position of the Independence Party (
Selvstendighetspartiet) at the National Assembly. He was later a member of the
Parliament of Norway as a representative of
Nordre Trondheim at the 1818, 1821 and 1822 parliamentary assemblies. He was President of the
Odelsting in 1821. He was a representative it at the parliamentary assemblies in 1827 and 1828. In 1836 he remained a deputy representative. From 1821 he was
county governor of
Hedmark, a position he held until 1849. Heidmann was married to Anna Catharina Bernhoff Ræder (1788–1858). She was the daughter of
Johan Georg Ræder and sister of
Johan Christopher Ræder, both of whom were military officers. He died in 1850 at his farm Kjonsud in
Stange Municipality. ==References==