Arthur Andrew Steiner-Davion (July 14th, 3037 - December 6th, 3062, aged 25 years) is the fourth of Hanse Davion and Melissa Steiner's five children. He was named after his grandfather Arthur Luvon and Andrew Redburn, a Federated Suns hero of the Fourth Succession War.
Always described as more heart than head, Arthur was often easily led. He attended Robinson Battle Academy and was often considered the protege of James Sandoval, who convinced him of the threat he believed the Draconis Combine still posed.
 Death and afterward
On December 6, 3062, Arthur was giving a speech when the building he was giving it from was the victim of a bomb attack. Though Arthur was presumed dead, no body was ever found. Victor Steiner-Davion believed that his sister Katherine had Arthur assassinated in order to prevent him from becoming popular enough to be a threat to her rule. He used this as justification for joining the gathering civil war, so Arthur's apparent assassination is often cited as the spark that ignited the FedCom Civil War.
The events of Patriots and Tyrants strongly hint that Arthur is still alive. The combination of the beginning of Arthur's speech and the philosophies of Devlin Stone have led to rampant fan speculation that Arthur becomes Stone, though there is no official confirmation of that.
 Philosophical and/or political views
James Sandoval had firmly convinced Arthur that the Draconis Combine was still a threat to the Federated Suns. So it was that Arthur was, at one point, trying to convince Tancred Sandoval to help assault the Combine. The contents of the beginning of Arthur's speech wherein he was believed to have been assassinated show the beginning of a philosophical shift towards democratic or republican thought, including the belief that power comes from the people.