Madame Rosmerta is the operator of the Three Broomsticks pub in Hogsmeade. She is a fiery personality who Ron Weasley has a little bit of a crush on in the third chapter of the series. Her main moments in the series usually occur in times of great suspense, like when Harry learns the truth about why Sirius Black is after him, and she also plays a pivotal role in the sixth installment.Oscar winning actress Julie Christie plays Rosmerta in 'Azkaban', and it is not known if she is returning for the sixth installment. Rosmerta appears in parts, 3-6 of the books.