一いちの御み子こ

noun

first-born imperial prince

Archaic term used in historical contexts for the eldest son of an emperor.

• 一いちの御み子こは、古ふるい記き録ろくでは天皇てんのうの長ちょう男なんを指さす。

  In old records, 一の御子 refers to the emperor's eldest son.