Robert Todd Lincoln was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 lawyer and Secretary of War, and the first son of President Abraham Lincoln

Abraham Lincoln

Abraham Lincoln was the 16th President of the United States, serving from March 1861 until his assassination in April 1865. He successfully led his country through a great constitutional, military and moral crisis – the American Civil War – preserving the Union, while ending slavery, and...

 and Mary Todd Lincoln

Mary Todd Lincoln

Mary Ann Lincoln was the wife of the 16th President of the United States, Abraham Lincoln, and was First Lady of the United States from 1861 to 1865.-Life before the White House:...

. Born in Springfield, Illinois

Springfield, Illinois

Springfield is the third and current capital of the US state of Illinois and the county seat of Sangamon County with a population of 117,400 , making it the sixth most populated city in the state and the second most populated Illinois city outside of the Chicago Metropolitan Area...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, he was the only one of Lincoln's four sons to live past his teenage years.
Lincoln graduated from Phillips Exeter Academy

Phillips Exeter Academy

Phillips Exeter Academy is a private secondary school located in Exeter, New Hampshire, in the United States.Exeter is noted for its application of Harkness education, a system based on a conference format of teacher and student interaction, similar to the Socratic method of learning through asking...

 in 1860, then studied at Harvard University

Harvard University

Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

 from 1861 to 1864, where he was a member of Delta Kappa Epsilon

Delta Kappa Epsilon

Delta Kappa Epsilon is a fraternity founded at Yale College in 1844 by 15 men of the sophomore class who had not been invited to join the two existing societies...

 (Alpha chapter). (Later in life, Lincoln also joined the Delta Chi

Delta Chi

Delta Chi or D-Chi is an international Greek letter college social fraternity formed on October 13, 1890,at Cornell University, initially as a professional fraternity for law students. On April 29, 1922, Delta Chi became a general membership social fraternity, eliminating the requirement for men...

 fraternity.) He then enrolled in Harvard Law School

Harvard Law School

Harvard Law School is one of the professional graduate schools of Harvard University. Located in Cambridge, Massachusetts, it is the oldest continually-operating law school in the United States and is home to the largest academic law library in the world. The school is routinely ranked by the U.S...

 but did not graduate.