The Dagda desired Boann, wife of Elcmar, and made the sun stand still so that nine months passed in a single day. Boann conceived and bore their son Aengus Óg before Elcmar returned.
Aengus Óg wasted from love-sickness after dreaming of Caer Ibormeith, a swan-maiden he had never met. After a year-long search, he found her chained in swan form among one hundred and fifty swans at Loch Bél Dracon, transformed himself into a swan to join her, and they flew together to Brú na Bóinne singing a sleep-song that held all Ireland for three days.
Midir fostered Aengus Óg for nine years in his síd at Brí Leith. When Aengus learned the truth of his parentage, Midir helped him confront the Dagda and claim Brú na Bóinne as his birthright.
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.
Aengus Óg claimed Brú na Bóinne from the Dagda by asking for it 'for a day and a night,' a trick of language that encompassed all of time. He dwells there still as lord of the great síd mound.
The Tuatha Dé Danann descended through the sky in a dark cloud upon Ireland, bringing with them the arts of sorcery, druidry, and every craft — a divine race who conquered the Fir Bolg and ruled until the coming of the Milesians.
Aengus Óg sheltered Étaín at Brú na Bóinne after Fuamnach transformed her, keeping her in a crystal sun-bower within the mound until the jealous wind scattered her from his care.
Aengus Óg confronted Nechtan at Brú na Bóinne, threatening him with weapons and driving him from the síd mound to claim it as his own, with the Dagda's arbitration confirming his right.
Aengus Óg tricked the Dagda out of Brú na Bóinne by asking for it 'for a day and a night' — since every day is composed of days and nights, the request encompassed all time. The father lost his dwelling to his son's wordplay.
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