Hyreios

Old farmer who was visited by three strangers one day. He invited them in and and offered them a generous meal of ox meat. To return the hospitality, the strangers asked Hyreios if he wished for anything. The old farmer sighed, and said jokingly, "yes, a son". What he did not know was that the tree guests were Zeus, Poseidon and Hermes.

After having finished their meal, the three gods took the skin of the ox and let their "divine water" on it. Then they buried it by the tomb of the farmer's wife.

Nine months later a son was born, and it was named Orion (=urine), who was to become a great hunter.
This myth very much resembles the Biblical story of Abraham and Sarah (1st Book of Moses).