Thranduil, son of Oropher, was king of the elves of Mirkwood during the Third Age. He fought under the command of his father in the Last Alliance, but when Oropher was killed, Thranduil became king. Thranduil is the father of Legolas. In the book "The Hobbit", Thranduil is only called the Elvenking. Thranduil also appears in "The Lord of the Rings".