Why Was Professor Trelawney Fired?

Why Was Professor Trelawney Fired? In 1996, then-High Inquisitor of Hogwarts Dolores Umbridge (presumably in lieu of the Headmaster) and then-Minister for Magic Cornelius Fudge signed Sybill Trelawney’s Order of Dismissal, due to her inadequate performance. When did Trelawney get sacked? Harry Potter World on Twitter: “8 March 1996: Professor Trelawney was sacked by Umbridge