Key Facts
- Period
- 1314–1429 (Sanzan era)
- Duration
- ~115 years
- Successor state
- Ryūkyū Kingdom
- Hokuzan conquered
- 1419 by King Shō Hashi
- Nanzan conquered
- 1429 by King Shō Hashi
Imperial Zenith Metrics
Historical Trajectory
Phase I: Rise
Following a period when Okinawa was loosely governed by local chieftains under a paramount king, the island fragmented into three defined kingdoms shortly after 1314, initiating the Sanzan period. Chūzan emerged as one of these kingdoms, controlling the central portion of Okinawa. Its rulers gradually consolidated power and built diplomatic and trade ties with neighboring states, establishing a foundation for future regional dominance.
Phase II: Zenith
At its height, Chūzan was the most powerful of the three Okinawan kingdoms, leveraging its central geographic position to develop maritime trade networks across the East China Sea. Its rulers cultivated relations with China and other regional powers, gaining prestige and resources that gave Chūzan a decisive advantage over its rivals Hokuzan in the north and Nanzan in the south.
Phase III: Decline
King Shō Hashi brought the Sanzan period to a close by conquering Hokuzan in 1419 and Nanzan in 1429, effectively ending Chūzan as a separate polity and unifying Okinawa under a single rule. The resulting unified state took the name Ryūkyū Kingdom, though Chūzan continued to appear in official royal documents as an alternate designation for the kingdom throughout its subsequent history.
Notable Imperial Reigns
Selected rulers mapping the empire’s trajectory