Sacrificial offerings began for the most part at the actual time of the funeral. The custom of pouring libations of wine, oil, and honey at the grave was probably in general use.
Rohde establishes the grave as the primary site of ongoing sacrificial cult, demonstrating that offerings and libations constituted a sustained, structured relationship between the living and the dead.
, Psyche: The Cult of Souls and the Belief in Immortality among the Greeks, 1894thesis