Richard A.F Penrose Lecture; This Richard A. D. Penrose lecture talks about the presidency of Abraham Lincoln and his lack of experience as Commander in Chief.; Further reading: https://www.penguinrandomhouse.com/books/295005/tried-by-war-by-james-m-mcpherson/
Ron Fairman discusses Marfan syndrome and how Lincoln was terminally ill at the time of his assasination. Marfan syndrome would have killed him within a year of his murder.