Asatsune was conferred a peerage in 986 at the age of 14 and started his career as a government official when he was appointed to Umanosuku (deputy minister for the institution for the horse care) in 988.
朝経は寛和2年（986年）に14歳で叙爵ののち、永延2年（988年）には右馬助に任官し、官途を始めた。