Like all great romantic cultures Irish lore is peppered with stories of forbidden love. Grainne was betrothed to Fionn MacCumhaill after his wife died. On meeting the much aged warrior, older than her father, she fell for the younger warrior Diarmud and so begins their flight across Ireland with Fionn MacCumhaill in pursuit.
Osin son of Fionn MacCumhaill falls in love with Niamh of Tir na nOg daughter of Mannanan Mac Lir. He goes back to Tir na nOg leaving Ireland. Many years later, homesick he returns on her horse but on condition he doesn’t set foot on the land. However, bending down to help someone he falls and dies, never to return.