Kamehameha Day on June 11 is a public holiday of the state of Hawaii in the United States. It honors Kamehameha the Great, the monarch who first established the unified Kingdom of Hawaiʻi — comprising the Hawaiian Islands of Niʻihau, Kauaʻi, Oʻahu, Molokaʻi, Lānaʻi, Kahoʻolawe, Maui and Hawaiʻi.