There are many families of loa: Rada (also Radha), Petro (also Pethro, Petwo), Agwé, Nago, Kongo and Ghede (also Guede, or Gede) among others. In a ritual the loa are called down by the "houngan" (priest) or "mambo" (priestess) to take part in the service, receive offerings, and grant requests.