Three Kingdoms is an expression for

1. The Three Kingdoms of Wei, Shu, and Wu of China in Sanguo Zhi (Chronicles of the Three Kingdoms).
2. The Three Kingdoms of Goguryeo, Baekje, and Silla of Korea in Samguk Sagi (also translated Chronicles of the Three Kingdoms).
3. The kingdoms of England, Scotland and Ireland in the days before the United Kingdom. For instance, it is found in the works of Jonathan Swift, and in the term Wars of the Three Kingdoms, a series of conflicts in Britain and Ireland, 1639-51.
4. The animal, vegetable, and mineral kingdoms in Bahya ibn Paquda's classic work, Duties of the Heart.
5. The Three Kingdoms multi-user dungeon.

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