Early life and career
 Prelude to war
In 3014, Anton Marik met with Chancellor Liao on Terra. Liao promised Anton Marik his support in a rebellion against Janos, most notably in the form of Wolf's Dragoons, the elite mercenary unit five regiments strong. Maximillian also promised Anton a betrothal to his eldest daughter, Candace Liao.
 Marik Civil War
On May 22, 3014, Anton Marik formally declared war against his brother's reign. Calling Janos a "madman" and "tyrant", he called upon all the provinces of the Free Worlds League to join his rebellion. Although many units and systems did flock to his banner, it was far less than what he'd expected. Rather than be devastated by his brother's betrayal, the war seemed to raise Janos from a long torpor. The Captain-General rallied his forces, soon putting Anton's supporters on the defensive. Severely handicapping Anton was the discovery that he was receiving support from House Liao, a fact that angered many.
By February 3015, the rebels controlled only a few remaining systems. The mental strain this placed on Anton was tremendous, and had started to show. At his headquarters on New Delos, Anton met with Jaime Wolf, ordering the mercenary commander to break his unit down into company-sized forces, and distribute them among the remaining rebel troops. Anton had hoped that this would slow the advance of Janos' forces. Wolf refused, citing the contract that had been signed. This led to a fallout between Anton and Wolf's Dragoons that had devastating consequences.
Anton promptly ordered the arrest of Joshua Wolf, brother of Jaime Wolf, and 27 other Dragoon personnel and dependents. (It would not be revealed until years later that Jaime Wolf's wife and two daughters were also among those taken.) Joshua Wolf and the 27 others were soon executed. Anton then sent a message to Jaime Wolf, announcing the arrests while concealing the executions, and using the prisoners as hostages.
 Death and aftermath
Wolf's response was swift, as all of Wolf's Dragoons descended on New Delos. After three days of fighting, Natasha Kerensky led her Black Widow Company through a forest fire, attacking the rear of Anton's palace and ultimately killing him when a wall collapsed on him. The Dragoons promptly destroyed every remaining rebel unit on New Delos.
Anton's rebellion died with him. In a twist or irony, Janos promptly offered Wolf's Dragoons employment with the Free World's League, which Jaime Wolf accepted. Though his brother Janos would rule for another 20 years, he was ultimately assasinated during the Andurien Secession.
It has been suggested that Anton was acting on false information from ComStar when he moved against the Dragoons. It is further speculated that he had been under ComStar's influence for some time.