Morgan and Salome

Morning and Evening

Morgan (literally meaning Morning) is synonymous with the Dawning of a New Day

Morgan carries Arthur westward to Avalon to heal him of the mortal wounds he suffered during his battle with the forces of darkness

Arthur's wound is a groin wound, symbolizing the phallus of Osiris, a reference to the future rulership of his realm by his lineage. In the case of John the Baptist, this is referred to as his beheading by Herod (Hydra/Herut-Typhon/Apophis) - that is, his removal from his birthright to the station of Kohen Gadol by Herod's supplanting the priesthood with his own political, non-Aaronic allies. John was beheaded long before his own death took place.

Salome is synonymous with Dusk - the personification of twilight

Salome literally means Dusk and Completion. 

Salome led to the division of John the Baptist - the day destroys the night, night divides the day...

Arthur is the King who shall come again

Arthur is the Sun: the Day

Morgan and Salome are the 'cardinal' points - the two eves (evenings: dawn and dusk). - the sisters whom balance out the polarities of day and night - good and evil - Osiris and Seth, etc.

the Two Sisters force the changing from day to night, and night to day, but with the prejudice that neither day nor night be absolute.