Melancholia or melancholy (from Greek: µέλαινα χολή melaina chole, meaning black bile) is a concept found throughout ancient, medieval, and premodern medicine in Europe that describes a condition characterized by markedly depressed mood, bodily complaints, and sometimes hallucinations and delusions. Melancholy was regarded as one of the four temperaments matching the four humours. https://en.wikipedia.org/wiki/Melancholia