He was a member of the Norwegian Constituent Assembly at Eidsvoll Manor in 1814.
[1] Motzfeldt was born at Skaun in Søndre Trondhjem county, Norway.
He was the son of Major Jacob Motzfeldt (1744–1816) and Sophia Cathrine Mühlenphort (1751–1789).
[3] He was a member of the Norwegian Constituent Assembly in 1814, representing Molde.
[4] He was elected to the Norwegian Parliament in 1830, representing the constituency of Christiania.