Abraham Lincoln

Abraham Lincoln was the 16th President of the United States.

Biography
In 1863, the Third Doctor gave to President Lincoln a sketched map he had made of the Confederate lines at Gettysburg. Lincoln gave the map to General Grant, thus helping the Union Army to win the Battle of Gettysburg. (TVA: Backtime)

On 19th November of that year, Lincoln delivered his Gettysburg Address. The First Doctor, Ian Chesterton, Barbara Wright and Vicki watched the speech on the Time-Space Visualiser. (DW: The Chase)

On 5th April 1865, the Fifth Doctor saved Lincoln from an assassination attempt in Richmond, Virginia. (TN: Blood and Hope)

Behind the scenes

 * Abraham Lincoln is one of only three real-world US Presidents to be portrayed on-screen in televised Doctor Who. The others are Barack Obama, who appeared in The End of Time, and Richard Nixon, who appeared in The Impossible Astronaut/Day of the Moon.
 * Backtime has its history a bit wrong. In reality, Grant was actually in the west, running the Union forces at the Battle of Vicksburg at the time that Gettysburg was being fought.