THE 4 TEMPERAMENTAL CATEGORIES AS DEFINED BY GALEN ON THE BASIS OF HIPPOCRATIC THEORY OF THE HUMOURS (15th century manuscript illuminations): #Sanguine (top left): excess of blood (energetic, courageous, hopeful, amorous) #Choleric (top right): excess of yellow bile (bad tempered, controlling) #Phlegmatic (bottom left): excess of phlegm (indifferent, sarcastic) #Melancholic (bottom right): excess of black bile (sulky, pessimistic, self-destructive)