Editing Diarmuid Ua Duibhne (section)

===Curse===

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When Crochnuit later bears a son to Roc Diocain following an adulterous affair, Fionn's steward, Aengus, accepts Diarmuid's new half brother as his foster son as well. Donn has refused to accept the child into his household for the stated reason of the father being a commoner.{{sfn|MacKillop|2004|p=74}}{{sfn|Gregory|Yeats|2012|p=375}}

Attending a dinner party hosted by Aengus at Brú na Bóinne, Donn becomes jealous when the household lavishes the son of Roc with as much attention as his own son. He kills the steward's son, Congus, when no one is looking, but is eventually identified as the murderer through magical means.{{sfn|Gregory|Yeats|2012|pp=375–376}} Roc suggests killing Diarmuid in retaliation but is prevented from immediately doing so by Aengus. With the help of a druid, Roc later resurrects his dead son in the form of a boar, then puts the boar under bonds to bring Diarmuid to death.{{sfn|MacKillop|2004|p=74}}{{sfn|Gregory|Yeats|2012|pp=376–377}}