Tales From Wilderland
Thranduil was the only son of Oropher, the King of the Woodland Realm. He was born sometime during the late First Age in Doriath before its fall. At the beginning of the Second Age, the Sindar travelled east and Oropher eventually founded Greenwood the Great.
Thranduil led the elven forces in the Battle of the Five Armies. His army was position on the southern side of the Mountain, and was the first to charge.
After the battle and of Thorin’s death, Thranduil took Orcrist, which was previously confiscated in Mirkwood, and laid it upon Thorin’s tomb. The treasure was divided among Elves and Men, and Thranduil received the emeralds of Girion. Bilbo, Gandalf and Beorn traveled with the elf-host back to Mirkwood but would not stay in the woods, even when Thranduil asked them to.
When Bilbo and Gandalf bade farewell, Bilbo gave Thranduil a necklace of silver and pearls. The king gave Bilbo the title of “elf-friend” and returned with his host in their halls.
King Thranduil has been reserved, but open to future alliances with both Dale and Erebor.