Ocean Master

Ocean Master (Orm Marius) is a fictional supervillain appearing in American comic books published by DC Comics. Created by Bob Haney and Nick Cardy, the character first appeared in Aquaman #29 (September 1966). He is an archenemy (second to Black Manta) of his half-brother Arthur Curry, otherwise known as Aquaman, and is commonly depicted as an adversary of the Justice League, the superhero team that his brother is a founding member of. Wikipedia