“When Dionysus was a guest at Oineias’ palace, the former fell in love with his host’s wife, Althea. However, when Oineias came to realize this, he decided that he should not mess with the God and so he let them be. From Dionysus love with Althea, Dieanira and Meleagros were born.
God Dionysus, to reward Oineias for his understanding, he taught him how to take care of grape vines and gave their juice the name of the mortal (οίνος).” 
May I just comment on how cool Oineias was? I mean, I’m so glad that there were humans that actually understood how powerful a God can be and just backed the heck off before they committed a crime against an immortal. At least, have one God on your side if you’re planning on making another your enemy, like think of anyone involved with Zeus… even a female cat would be Hera’s victim if she got all honey-dovey with the Father of the Gods. It wouldn’t be Hera’s fault though, as Zeus really couldn’t keep it in his pants but that’s not the point. The point is that in most myths, some naïve mortal won’t accept the fact that by having a God around means trouble. Concluding, once a God sets eyes on you, you got to be his or else death awaits (or in the case of Zeus, both).
 Source : Ρίσπεν Ζ., Ελληνική Μυθολογία, Εκδόσεις Τριήρης, Τόμος 3ος, σ.398