Referred to simply as the Elven-King in the book, he gets a name in the Jackson film: Thranduil.
The father of Legolas (don’t forget the Elven pretty boy was a prince), he appears in the opening prologue, played by Lee Pace.
As he refuses to help the Dwarves in their fight against Smaug, expect him to play a prominent part in later episodes, not least when Leggy gets stuck into the action for the Battle of the Five Armies.
The coolest detail of Thranduil’s brief appearance is undoubtedly the giant stag he rides, reminding us in no uncertain terms that he’s a Wood Elf.
And Pace’s cameo is just about cool enough to wash away the awful memories of his turn as Garrett in The Twilight Saga: Breaking Dawn - Part 2.