Mera

Mera was once the queen of an aquatic dimension called Xebel. Several years ago, a criminal named Leron seized control of the kingdom and exiled Mera from her kingdom. Mera fled for Earth whereupon she met the Atlantean sea-king, Aquaman. Aquaman vowed to assist Mera in any way possible and, when Leron pursued Mera to Earth, Aquaman defeat Leron. However, rather than returning to the throne of her kingdom, Mera elected to live in Atlantis with Aquaman.

Background
As Mera continued to share in adventures with the sea-king, the two began to fall in love. The two were soon wed and Mera lived with Aquaman at the Atlantean Royal Palace as Queen of Atlantis.

Before long, Mera gave birth to a son, however, Aquaman's nemesis Black Manta kidnapped her child and confined him inside of a translucent tank filled with poison where the child lapsed into a coma and, despite Mera embarking on an ambitious crusade to save him, died due to the poison.

Suffering from a nervous breakdown due to the death of her baby, Mera abandoned her husband, blaming his "weak genes" for their child's death. It was her belief that had her son been born of a man from her dimension, then he would have been strong enough to survive Black Manta's attack. Their marriage dissolved, Aquaman left Atlantis while Mera stayed behind to tend to the kingdom.

Heroes

 * Initially thought to be behind the Atlantean attack on Metropolis, it was revealed that the "Queen Mera" commanding the Atlantean armies was actually Circe in disguise; having infiltrated and gained control of the Atlantean royal family, including Aquaman. It is unknown what she has done with the real Mera.

Trivia

 * Mera first appeared in Aquaman #1 (October 1963).