Sol and Luna: The alchemical King and Queen. Woodcut 2 of the Rosarium Philisophurum, 1550 edition: courtesy of the Alchemical Website.

from Jung's "Psychology of the Transference", 1946 (Jung, 1998:191-2)

"It would be quite natural to suppose that the king and queen represent a transference relationship in which the king stands for the masculine partner and the queen for the feminine partner. But this is by no means the case, because the figures represent contents which have been projected from the unconscious of the adept (and his soror mystica [mystical sister]). Now the adept is conscious of himself as a man, consequently his masculinity cannot be projected, since this only happens to unconscious contents. As it is primarily a question of man and woman here [ie. not of father figures, or other masculine, potentially unconcious elements], the projected fragment of personality can only be the feminine component of the man, i.e. his anima, Similarly, in the woman’s case, only the masculine content can be projected. There is thus a curious counter-crossing of the sexes: the man (in this case the adept) is represented by the queen, and the woman (the soror mystica) by the king. It seems to me that the flowers forming the ‘symbol’ suggest this counter-crossing." C.G. Jung