noun
Genji and Heike clans; two opposing sides
Refers to the Minamoto (源) and Taira (平) clans, especially in the context of the Genpei War (1180–1185). By extension, can mean any two rival factions.
源平の戦いは日本の歴史を大きく変えた。
The Genpei War greatly changed Japanese history.
この試合はまるで源平の争いのようだ。
This match is just like a battle between two rival sides.
Compound of 源 (Gen, Minamoto clan) and 平 (Hei, Taira clan). The reading げんぺい is a standard Sino-Japanese combination.