Arthur King

Merlyn, sometimes known by the identity of Arthur King, is a fictional mercenary and assassin and a recurring antagonist featured in comic books published by DC Comics. He is associated with the Green Arrow line of titles and was introduced in Justice League of America 94 in November, 1971. A version of the character has also appeared on the CW Network television series Arrow, where he is identified as Malcolm Merlyn. He is played by actor John Barrowman in the series.