In 1783, Nguyen Anh was defeated by Tay Son and ran away to Con Dao Island. In conjunction with fishermen, Lord Nguyen Anh discovered 3 villages: An Hai, An Hoi, and Co Ong. Nguyen Anh sent Prince Canh followed by Ba Da Loc to France to require for reinforcements to fight against the Tay Son troops. Lady Phi Yen, the second wife of Nguyen Anh, suggested him to not do so. Nguyen Anh was angry with her and thought that his wife might have been dealing with Tay Son troops. He supposed to kill her. Just before Tay Son troops attacked the island, Nguyen Anh forced his wife in jail and went to sea. Prince Cai wished his mother to go with them when he was 4 years old. Nguyen Anh was angry and threw his son into the ocean. The body of Prince Cai drifted onto Co Ong Beach where villagers buried him.

According to the legend, Lady Phi Yen was rescued from the stone jail by a tiger together with an ape. She stayed with the villagers, taking care of Prince Cai’s grave. when she met an unfortunate problem with a man, she suicided to keep her pride. The villagers mourned her and constructed a temple in her honour. In 1861, the French colonialists invaded the island and broke down the temple. In 1958, the temple was rebuilt on its current area.

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