the four major historical clans: Minamoto, Taira, Fujiwara, and Tachibana
Refers collectively to the four most prominent noble clans of ancient Japan: 源 (Minamoto/Genji), 平 (Taira/Heike), 藤 (Fujiwara), and 橘 (Tachibana). Used in historical or literary contexts.
The Genji, Heike, Fujiwara, and Tachibana are known as the four great clans of ancient Japan.