In 193 A.D., a time of severe unrest in the Roman Empire, the Praetorian Guard did something diabolical. The special army was supposed to be loyal to the emperor, but instead, they assassinated the emperor, Pertinez, and sold the empire to the highest bidder.
That was wealthy senator Didius Julianus, who came up with a truly astronomical price: 25,000 sestertii for every member of the army (about $1 billion today).
But the plan didn’t work out as intended. The new "emperor" was never recognized and quickly deposed, and the real emperor, Severus, executed the guards who ran the scam.