女系天皇
Meanings
1
matrilineal emperor of Japan; emperor with imperial mother and non-imperial father
Refers to an emperor (male or female) whose mother belongs to the Imperial family but whose father does not. Contrasts with 女性天皇 (female emperor), which simply means a female emperor regardless of lineage.
See also: 女性天皇
The possibility of a matrilineal emperor was discussed in the Diet.
A matrilineal emperor refers to an emperor whose father is not a member of the Imperial family.