Aengus Óg, as Diarmuid's foster-father, repeatedly sheltered and aided the lovers during their flight from Fionn mac Cumhaill, wrapping them in his cloak of invisibility and negotiating truces on their behalf.
Fionn mac Cumhaill hunted Diarmuid Ua Duibhne and Gráinne across Ireland for years after Gráinne placed a geis on Diarmuid Ua Duibhne to elope from Fionn mac Cumhaill's wedding feast — a betrayal that consumed him with jealousy until he contrived Diarmuid Ua Duibhne's death on Ben Bulben.
Fionn mac Cumhaill lured Diarmuid Ua Duibhne to hunt the enchanted boar of Ben Bulben, knowing the beast was fated to kill him — and when Diarmuid Ua Duibhne lay gored and dying, Fionn mac Cumhaill let the healing water slip through his fingers twice before the third handful came too late.
The Fianna roamed the forests and hills of Ireland under Fionn mac Cumhaill, with warriors like Oisín and Diarmuid Ua Duibhne among their ranks — each tested by impossible feats of skill and endurance before he could join.
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