The Collaborative International Dictionary of English v.0.48:
Promulgator \Pro"mul*ga`tor\, n. [L.] One who promulgates or publishes. --Dr. H. More. [1913 Webster]WordNet (r) 3.0 (2006):
promulgator n 1: (law) one who promulgates laws (announces a law as a way of putting it into execution)