When Caligula became the Roman emperor in 37 CE, replacing the hated Tiberius, the public welcomed his reign, and for a time it was uneventful. Seven months later, he fell severely ill, and when he recovered, he was a changed man. Suddenly, his reign was marked by financially ruinous extravagance, unmatched cruelty, and rampant executions, even of his former supporters. He was assassinated within a few years. What may have caused the mental instability Caligula displayed after his illness? Discuss
Source: The Free Dictionary