She thought about writing a novel for several years before she finally 'put pen to paper'.
Samuel L. Clemens is better known by his 'pen name' “Mark Twain.”
He was sent to 'the pen' [=the penitentiary] for armed robbery.
(..) I drink and I know things. The dragons Aegon used to conquer Westeros ranged over hundreds of miles. Then Daenerys's ancestors started chaining them up in pens. A few generations later, the last dragons were no larger than cats. They must be unchained or they'll waste away. (..)2016 TvShow: Game of Thrones Title: Home Season: 6 Episode 2