John Green uses Alexander the Great to ask a harder question: what actually makes someone "great"? He runs through the basics first, the conquered Persian Empire, the horse Bucephalus, the empire that fractured into rival kingdoms after Alexander's death, then pivots to how later generals treated him as a template, with Pompey the Great and Napoleon both modeling their own ambitions on his campaigns. Green tests the word "great" against modern celebrity, comparing Alexander's fame to Kim Kardashian and Mike "The Situation" Sorrentino, and argues that greatness often just means enough people agree to call you great, accomplishment optional. He also turns to gender bias in how history gets told, correcting the popular myth about Catherine the Great's death and pointing out how differently we narrate powerful women versus powerful men. The tone stays fast and joking throughout, but the underlying argument is serious: history's judgments about who counts as great say as much about the judges as the judged.