3 definitions
The Rex marinus (n.) rules a barren land of innocence where only like pairs with like, and is king precisely because he can beget a son and daughter "in his head" — a potential traitor to paradise.
Rex marinus (n.) is defined in Ruland's alchemical lexicon as king, soul and spiritual water that moistens the female and returns to its source, so the king was first a fertilizing pneuma and only secondarily gold.
Rex marinus (n.) is the king in the sea who cries for deliverance while people sit idle at home, thinking his cry the roar of Scylla and Charybdis; the sea is the alchemists' own darkness, the unconscious.