Prince Kūhiō Day is observed in Hawaii every March 26, honoring Prince Jonah Kūhiō Kalanianaʻole, who was the heir to the throne of the Kingdom of Hawaii and later served as a territorial delegate in the U.S. Congress. Born on March 26, 1871, he was a descendant of Kaumualii, the last independent ruler of Kaua’i and Ni’ihau, and was adopted by Queen Consort Kapi’olani after the death of his parents. The holiday was officially established by the Hawaii legislature in 1949 and is one of only two holidays in the U.S. dedicated to royalty, the other being Kamehameha Day on June 11. The day commemorates Kūhiō's contributions to Hawaiian politics and culture, particularly after his return to Hawaii in 1902, where he became involved in the Republican Party and was elected to Congress in 1903.