It takes an army to conquer the world, not just a general. No matter how well versed you are in battle or how brilliant your strategic insight, no matter your sword-wielding prowess or accuracy with the bow, you cannot conquer the world by yourself.
Greatness is a team sport.
No-one lives long enough to achieve such lofty ambitions with their backs exposed.
Certainly, leadership, charisma and intelligence help get you there. So does recognising the best in others and surrounding yourself with those who sare passionately dedicated to the same cause.
Your greatness is the result of your tribe. Not the other way around.