Leonhard Fredrik Rääf (1786 – 1872) also known as Ydredrotten was a Swedish folklorist, local historian and conservative politician from Ydre.
During a time Rääf had a literary saloon in Tomestorp which was frequented by among others Per Daniel Amadeus Atterbom.
In 1843 Rääf moved to a farm in Forsnäs where he lived until death in 1872.
Rääf is buried together with some possessions in a Viking-style mound at the shores of Lägern.