Background
Weidemann was born in Sukkestad, Østre Toten as the son of bailiff Lars Weidemann (1742–1826) and Maria Sommerfeldt (1754–1823).
Weidemann was born in Sukkestad, Østre Toten as the son of bailiff Lars Weidemann (1742–1826) and Maria Sommerfeldt (1754–1823).
Weidemann enrolled as a student at the University of Copenhagen in 1790, and graduated as candidate.jur. in 1793. He was appointed stipendiary magistrate of the district of Søndre Sunnmøre in 1798, and stipendiary magistrate of the district of Toten from 1802. He represented Kristians amt at the Norwegian Constituent Assembly at Eidsvoll in 1814.
In 1815 he published three small political proposals, one regarding the Supreme Court, one on surveying of farm land, and one on finance.
He served as County Governor of Hedmark from 1817 to 1821, and as County Governor of Kristians amt from 1821 to 1851. He was elected to the Parliament of Norway in 1814.
From 1815 to 1816 he served as President of the Odelsting. He was elected to the Parliament in 1827, when he was President of the Storting, in 1828, 1836 (President of the Lagting) and in 1839.
He served as county governor for almost 35 years, participated at the Norwegian Constituent Assembly in 1814, and was a member of the Parliament of Norway for several periods.