VIDEO : Rickman Had ?Frustrations? Playing 'Harry Potter's Snape

Alan Rickman had a stellar acting career.
He is best known for portraying Severus Snape in the Harry Potter movies.
Rickman didn?t always love playing Snape.
A collection of letters from from the actor?s personal collection are set to be auctioned off.
The letters hint at Rickman?s frustrations with the franchise.
--- I know, at times, you are frustrated but please know that you are an integral part of the films. And you are brilliant.--- One letter from producer David Heyman reads.
---It?s as if David Yates has decided that this is not important in the scheme of things i.e. teen audience appeal.--- Rickman in a letter