King Kalākaua was called "the Merrie Monarch" because he loved the joyful things in life. While he was king, people started to do hula again. (It had been banned by Queen Kaahumanu in 1830.) There is a hula festival named for him, the Merrie Monarch Festival. He also brought back the Hawaiian martial art of Lua, and surfing. He and his brother and sisters were known as the "Royal Fours" for their musical talents. He wrote "Hawaii Ponoi", which is the state song of Hawaii today. Kalākaua strongly supported the ukulele as a Hawaiian instrument.