Major Henry Rathbone was a military officer who accompanied President Abraham Lincoln when he was shot during a production of Our American Cousin at Ford's Theatre.
In the Timeless Universe
In the original timeline, Henry Rathbone accompanies President Abraham Lincoln and First Lady Mary Todd Lincoln along with his fiancée, Clara Harris on April 14, 1865. After John Wilkes Booth shoots Lincoln, Rathbone tries to stop him but is non-fatally stabbed in the abdomen.
Henry Rathbone at Wikipedia