Less than a year before John Wilkes Booth assassinated Abraham Lincoln, Booth’s brother, Edwin Booth, saved Lincoln’s oldest son, Robert Todd Lincoln, from being injured and possibly killed by a train. Edwin Booth was regarded as one of the great Shakespearean actors of the 19th century. He was the manager of the Winter Garden Theatre in New York City, where many Shakespearean productions were made in 1862. Edwin was a supporter of Lincoln and a Unionist, and he was not close with his brother, who supported secession. In 1863 or 1864, the exact date is uncertain, Edwin Booth and Robert...