Alluded to in the Batman vs Superman movie, Aquaman is a member of the Justice League.
Created by Paul Norrisand Mort Weisinger, the character debuted in More Fun Comics #73 (November 1941). Initially a backup feature in DC’s anthology titles, Aquaman later starred in several volumes of a solo title. During the late 1950s and 1960s superhero-revival period known as the Silver Age, he was a founding member of the Justice League of America. In the 1990s Modern Age, Aquaman’s character became more serious than in most previous interpretations, with storylines depicting the weight of his role as king of Atlantis. (https://en.wikipedia.org/wiki/Aquaman)
Cast out from Atlantis as a baby, Arthur Curry grew up on land, thinking himself a normal human. But when he matured, Atlantis returned, claiming him as their rightful king. Caught between a surface world constantly ravaging the sea and Atlanteans looking to lash out in revolt, he’s committed to protecting the entire globe. Aquaman is the king of all things aqua. He can breathe underwater, swim at tremendous speeds, and telepathically communicate with sea life. Being able to withstand ocean depths, he gets bonus points on land with his superhuman strength, enhanced senses, and nearly impenetrable skin. And although his courage and decisive nature have proven him a true heir to Atlantis’s throne, the continual conflict between land and sea makes him a citizen of both—and at home in neither. (http://www.dccomics.com/characters/aquaman)