Harry Potter star Alan Rickman, who played Snape in the films saying that he was frustrated by the lack of development that his character experienced throughout the film series.

Rickman became a household name throughout the long-running series doing a terrific job of portraying the complexity that was Severus Snape. Despite his success, a number of papers that have been found following Alan Rickman’s death in 2016 suggests that he may not have always been happy in the role.

Rickman passed away aged 69 in 2016 following a successful career and life. It has been made apparent that he made numerous notes regarding his character’s development under the heading “Inside Snape’s Head”.

Alan Rickman said in one of the notes to himself that it was “as if David Yates has decided that this is not important in the scheme of things” in reference to the character development of Snape.

Despite his frustrations, the actor kept all of the scripts from the movies as well as numerous letters written to him by colleagues with whom he worked on the films with.

“Thank you for making it a success. I know, at times, you are frustrated but please know that you are an integral part of the films” said producer David Hayman in a postcard sent to Rickman with reference to the Harry Potter films.

Much of the letters and scripts written by and to Alan Rickman are set to be auctioned off in what is expected to be a collection worth well over $1 million. The collection includes letters from Daniel Radcliffe, Nicole Kidman and even J.K. Rowling herself congratulating and thanking Rickman for his work with Snape.

Rowling said in one of her letters, “Thank you for doing justice to my most complex character.” A seemingly fitting and humbling compliment of his efforts.