How did the word lunatic originate?

The Word "lunatic" originated from the Latin term "lunaticus," meaning "of the moon." This etymology reflects the ancient belief that mental illness was influenced by the phases of the moon, particularly the full moon. The term was used to describe individuals who exhibited erratic behavior, thought to be connected to lunar cycles. Over time, "lunatic" became a legal and medical term for those deemed insane, though it is now considered outdated and stigmatizing.