postilion
noun
                                                                                                                            
                                                            pos·til·ion
                    
                                                                                                              
                                                                                                                                  pō-ˈstil-yən  
                                                                                                                              
            pə-
                                                      
                                                          
            variants  
 or postillion
        
    
                                
              
          
                                                      : one who rides as a guide on the near horse of one of the pairs attached to a coach or post chaise especially without a coachman                                      
                
                    
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  Merriam-Webster unabridged




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