Tiffany Aching is a fictional character in Terry Pratchett's satirical Discworld series of fantasy novels. Her name in Nac Mac Feegle is Tir-far-thóinn or "Land Under Wave". Tiffany is a trainee witch whose growth into her job forms one of the many arcs in the Discworld series. She is the main character in The Wee Free Men, A Hat Full of Sky, Wintersmith, I Shall Wear Midnight and The Shepherd's Crown. Tiffany grows up over the course of the series, from nine years old in The Wee Free Men to being in her late teens in The Shepherd's Crown.