Power, it turns out, has a long history of breaking the people who hold it. This rundown moves through twenty-five rulers whose reigns tipped into cruelty, paranoia, or outright delusion, from Rome's Caligula, who reportedly tried to appoint his horse to the Senate, to Russia's Ivan IV, whose suspicion of his own nobles fueled a reign of purges and executions. China's Qin Shi Huang appears chasing immortality potions that likely poisoned him, while Bavaria's Ludwig II drained the treasury on fantasy castles before his mysterious drowning. Ottoman sultan Ibrahim, French king Charles VI, and Sweden's Erik XIV round out a lineup of monarchs whose behavior ranged from erratic to violently unstable. Each case gets a quick sketch of what the ruler did and what may have driven it, treating megalomania and mental collapse as recurring occupational hazards of absolute power rather than isolated oddities. The throughline is less about scandal than pattern: unchecked authority, across centuries and continents, keeps producing the same kinds of breakdown.