Peter Motzfeldt was a member of the constitutional assembly in Norway in 1814, then a Norwegian member of the Council of State Division in Stockholm 1814–1816, 1818–1819, 1824–1825, 1828–1829, 1831–1832, and 1834–1835, Minister of the Army 1816–1818 and 1819–1822, and Minister of Auditing 1829–1831, 1832–1834, 1835–1836, and 1836–1837.