(Sybil Trelawney, Sybil, Trelawney) Divinations professor at Hogwarts; obsessed with dark predictions and death predictions. Hermione gets fed up with her and leaves her class. Ron and Harry think she is crazy.

Origin:

Sybil - Sybils were ancient prophetesses who foretold the future at the Oracle at Delphi.

Trelawney - Trelawney is the hero of a Cornish poem called "And Shall Trelawney Die?", perhaps a reference to her custom of telling one student a year he will die before its end.