Who created Rivendell, ruled by Elrond who appears in a trilogy?
Rivendell: Rivendell is an Elven realm in Middle-earth, a fictional world created by J. R. R. Tolkien. Elrond:  He is introduced in "The Hobbit", and plays a supporting role in "The Lord of the Rings" and "The Silmarillion".
J. R. R. Tolkien.