Ken ThompsonDune, by Frank Herbert.
You are a teenaged prince, set to inherit a desert planet that is the only source of a mind altering herb that enables space travel and you discover you are the result of centuries of selective breeding; this combined with the herb allows you to see and manipulate multiple futures to try and accomplish the least bad ending you can see, so you start an intergalactic holy war.
4 of 5 library cats 🐈 🐈 🐈 🐈.
