Albus Dumbledore was the leader of the Order of Phoenix, and the phoenix in reference is Fawkes, the phoenix that accompanies him. Other major members of the Order of the Phoenix include his brother Abeforth Dumbledore, Mad-Eye Moody, James and Lily Potter, Arthur and Molly Weasley, Sirius Black, Remus Lupin, Frank and Alice Longbottom, Elphias Doge, and Dedalus Diggle. Several other members existed.