What does Professor Trelawney teach at Hogwarts? Loyalty. Professor Sybill Patricia Trelawney (b. 9 March, pre 1962) was a half-blood witch and professor of Divination at Hogwarts School of Witchcraft and Wizardry. She is the great-great-granddaughter of the celebrated Cassandra Trelawney, who was also a Seer.
What did Trelawney teach? Sybill Patricia Trelawney is the Divination teacher.
How long did Professor Trelawney teach at Hogwarts? Trelawney tells Professor Umbridge that she refuses to accept her dismissal; she has been at Hogwarts for sixteen years, and the castle is her home.
Why is Hermione mad at Professor Trelawney? Hermione Granger decided to quit the class for good, as Trelawney told her that she had not the Inner Eye, and because she thought Trelawney’s predictions were inaccurate, and the few accurate ones are due to mere chance. Not many students liked her because they thought she was mad.