Order of the Phoenix (fictional organisation) Order of the Phoenix (fictional organisation) The Order of the Phoenix is a secret organisation in the "Harry Potter" series of fiction books written by J. K. Rowling. Founded by Albus Dumbledore to fight Lord Voldemort and his followers, the Death Eaters, the Order lends its name to the fifth book of the series, "Harry Potter and the Order of the Phoenix". Before the Harry Potter series starts – when the character Lord Voldemort declared war on the wizarding world – Albus Dumbledore, headmaster of Hogwarts School of Witchcraft and Wizardry and an upstanding and powerful citizen of the wizarding
Hogwarts staff as the possibility of creating more than one Horcrux. In "Harry Potter and the Deathly Hallows", Slughorn briefly appears with other teachers assembling to fight Death Eaters. As Snape is now Headmaster, Slughorn has again assumed the post of Head of Slytherin. Though he is initially hesitant to join in the Battle of Hogwarts and is assumed to have evacuated with his house, he returns to the fray later on. It is revealed that he has not fled, but has recruited a large number of reinforcements to fight for Hogwarts. He then summons up the courage to duel Voldemort, alongside