text: #medievalsky 'Humour' in this context means fluid. 
  
  According to ancient & medieval medicinal theory, there were 4 humours/fluids of the body: 
  
  Fuil/linn dearg - sanguine
  Linn finn - phlegmatic
  Linn dubh - melancholic
  Linn ruagh - choleric
  
  The balance/imbalance of humours explained health/disease