Caligulism

== English == === Etymology === From Caligula +‎ -ism. The coining of this term is often attributed to Horace Walpole, who used it to describe Frederick, Prince of Wales, in a letter written on November 29, 1745, but in fact, the use of the term predates Walpole. === Noun === Caligulism (countable and uncountable, plural Caligulisms) Madness, especially when of an extravagant or sadistic nature.