What does it mean to be a father? Fatherhood is one of history’s enduring puzzles. Why are fathers the way that they are? We look at being a dad through the lens of history, philosophy and the examples of some of Western civilization’s most emblematic fathers to understand how this role of protector, caretaker, provider and disciplinarian evolved. Augustine Sedgewick is the author of "Fatherhood: A History of Love and Power."