Legba originates in Dahomey , West Africa, where he is the spokesman and interpreter of the gods. Without Legba's aid, the gods would not be able to communicate with themselves or with humans.

In Haitian Voodoo, Legba is guardian of the gate that joins worshippers and spirits. No loa can enter a worshipper without the permission of Legba. He is often identified with St. Peter, as keeper of the key to the gate. His appearance is that of a weak, poorly dressed old man, suporting himself on a crutch. Although he appears feeble, this spirit is extremely strong, and possession of a worshipper by Legba will often cause the person to fall violently to the ground. (http://www.eliki.com/ancient/myth/haitian/)