Big Mac took the baby under his fin and raised LUGH as his child until he was old enough to stay with Uncle GOIBHNIU, the Great Smith. There he grew so strikingly handsome and amazingly skilled that he decided to apply for the post of apprentice God. Passing an interview at the God Employment Center with flying colors (and flying stones), he zoomed up the career ladder to become Top God. And the rest is history.
LUGH waged triumphantly against baddies for many years and eventually slew his wicked grandpa with a sling. After fathering CUCHULAINN, the Irish hero, his Celtic powers dwindled as Christianity increased. He slid slowly down the mythological ladder and ended up as the first Leprechaun. How embarrassing.