Yvonne Steiner-Davion

Yvonne Steiner-Davion was a character in the fictional BattleTech universe. Yvonne was the fourth Prince Hanse Davion and Archon Melissa Steiner's five children. As such, she was the fourth in line to the throne of the Federated Commonwealth. She attended and graduated from the New Avalon Institute of Science. She was always close to her older sister, Katherine, who often treated her like a dress-up doll.

When her oldest brother, Archon-Prince Victor, chose to lead to a task force to the Clan homeworlds, he left Yvonne as his regent. Unfortunately for Yvonne, Katherine seized the opportunity and quietly stirred up discontent against Victor and Yvonne. It got so bad that Yvonne practically begged Katherine to take over. She did so, becoming the leader of both realms of the fractured Federated Commonwealth. Yvonne then traveled to Luthien to meet her brother and inform him of what she knew. Initially, Victor allowed Katherine to stay on the throne, but eventually circumstances compelled him to take up arms against his oldest sister.

When the FedCom Civil War was over, Victor abdicated his throne and invested Yvonne as the leader of the Federated Suns. Technically she could not become the First Prince since she did not have the requisite military service, but she became the Regent for her as-yet unconceived child.