[1] It is celebrated annually on March 26, to mark the birth of Prince Jonah Kūhiō Kalanianaʻole — heir to the throne of the Kingdom of Hawaiʻi, prince of the House of Kalākaua, and later territorial delegate to the United States Congress.

[2] It was established in 1949 by the legislature of the Territory of Hawaii.

[3] As a delegate, Kuhio authored the first Hawaii Statehood bill in 1919.

Prince Kūhiō Day is one of only two holidays in the United States dedicated to royalty, the other being Hawaiʻi's King Kamehameha Day on June 11.

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