Achilles was the son of the nymph Thetis and Peleus.  Both Zeus and Poseidon had been courting Thetis until a prophecy by Prometheus warned that Thetis would bear a son greater than his father.
        
        
     
    
 replied to:  wellis
         
        
            
            Replied to:  Achilles was the son of the nymph Thetis and Peleus....
         
        According to a first-century AD account by Statius, Thetis tried to make her son immortal by dipping him in the river Styx.
        
        
     
    
 replied to:  jkwilliams
         
        
            
            Replied to:  According to a first-century AD account by Statius, Thetis tried to...
         
        But the ankle wasn't dipped