[1] He was born in the neighborhood of Abelsøe in the Østensjø district of Oslo, Norway.
He was the son of Anne Hedevig Brochmann (1752-1834) and Hans Prydz (1751-1781), and had three brothers.
[3][4] He began his military career as a commissioned officer at Nordenfjeldske infantry regiment.
[5] Peter Blankenborg Prydz was elected to the Norwegian Constituent Assembly in 1814, representing the army regiment Nordenfjeldske Infanteri-Regiment.
[7] He is buried at Skedsmo kirke, a cruciform church from 1180 in Lillestrøm municipality in Akershus county.