Heungseon Daewongun, also known as the Daewongun, Guktaegong or formally Heungseon Heonui Daewonwang and also known to contemporary western diplomats as Prince Gung, was the title of Yi Ha-eung, regent of Joseon during the minority of Emperor Gojong in the 1860s and until his death a key political figure of late Joseon Korea.