The is a period in the history of the Okinawa Islands when three polities, namely , and , are said to have co-existed on Okinawa. It is said to have started during King Tamagusuku's reign (traditional dates: 1314–1336) and, according to Sai On's edition of the Chuzan Seifu, ended in 1429 when Sho Hashi unified the island. Historical records of the period are fragmentary and mutually conflicting. Some even question the co-existence of the three polities.