The ghost of U.S. president Abraham Lincoln, also known as the White House Ghost, is said to have haunted the White House since Lincoln's assassination in 1865. Lincoln's ghost has also been said to haunt many of his former residences in Springfield, Illinois, including his former law office. Of the several stories about the ghosts of former presidents of the United States revisiting the White House, Lincoln's ghost is perhaps the most common and popular. First Lady Grace Coolidge, Queen Wilhelmina of the Netherlands, Prime Minister Winston Churchill, and President Theodore Roosevelt are among those who claimed to have seen Lincoln's ghost in the White House. Reported apparitions The White House's most famous alleged apparition is that of Abraham Lincoln. The first person reported to have actually seen Lincoln's spirit was First Lady Grace Coolidge, who said she saw the ghost of Lincoln standing at a window in the Yellow Oval Room staring out at the Potomac. Perhaps the most famous incident was in 1942 when Queen Wilhelmina of the Netherlands allegedly heard footsteps outside her White House bedroom and answered a knock on the door, only to see Lincoln in frock coat and top hat standing in front of her (she promptly fainted). British Prime Minister Winston Churchill loved to retire late, take a long, hot bath while drinking a Scotch, and smoke a cigar and relax. There is an account that on this occasion, he climbed out of the bath and naked, but for his cigar, walked into the adjoining bedroom. He was startled to see Lincoln standing by the fireplace in the room, leaning on the mantle. Churchill, always quick on the uptake, simply took his cigar out of his mouth, tapped the ash off the end of his cigar and said "Good evening, Mr. President. You seem to have me at a disadvantage." Lincoln smiled softly, as if laughing and disappeared. President Theodore Roosevelt, presidential daughter Maureen Reagan, her husband Dennis C. Revell, and a number of staff members of the Franklin D. Roosevelt administration all claimed to have seen Lincoln's spirit. On one occasion FDR's personal valet ran screaming from the White House claiming he had seen Lincoln's ghost. One of William H. Mumler's most famous photographs apparently shows Mary Todd Lincoln with the "ghost" of her husband, Abraham Lincoln. Paranormal researcher Melvyn Willin, in his book Ghosts Caught on Film, claims that the photo