Answer:
When sacrificing to a hero (as opposed to a god), the Greeks poured a sacrifice of blood in a cup instead of an altar.
Explanation:
Despite making sacrifices to the gods, the Greeks also made sacrifices for the heroes in a ceremony called Libation.
The libation was a ritual where the Greeks poured water, wine, blood and other liquids into a cup known as phiale. These liquids were mixed as a way of honoring Greek heroes for their deeds. When a Greek hero was also a god, the offering was made twice, once for heroism and once for divinity.
Half of the liquid present in the phiale was spilled and the other half was consumed by the Greeks.
