Llŷr and Penarddun are the parents of Brân the Blessed, Branwen, and Manannán mac Lir — the royal family of the Island of the Mighty whose fates unfold across the Second and Third Branches of the Mabinogi.
Fand, Pearl of Beauty among the sídhe, is the wife of Manannán mac Lir. When she was besieged by enemies in the Otherworld, she summoned Cú Chulainn to her aid, and their love affair nearly shattered Cú Chulainn's marriage until Manannán shook his cloak of forgetfulness between the mortal hero and the sea god's wife.
Manannan mac Lir fostered the young Lugh, raising him and equipping him with magical arms — including the boat Scuabtuinne, the horse Aonbarr, and the sword Fragarach — preparing him to champion the Tuatha Dé Danann.
Manannán mac Lir came to the mortal queen Caintigern in the shape of her husband Fiachna and begot Mongán, then took the boy to the Otherworld to raise him until he was old enough to claim his earthly kingdom.
After Pwyll's death, Rhiannon wed Manawydan fab Llŷr, and together they endured the enchantment that stripped Dyfed bare of all its people, wandering as exiles until Manawydan's cunning broke the spell.
Manannán mac Lir wards the boundary between the mortal world and the Otherworld, raising the féth fíada — a veil of enchanted mist — that hides Tír na nÓg and the sídhe from mortal sight.
Manannán mac Lir presides over Emain Ablach, the island of apple trees beyond the western sea, where he feasts with the immortal sídhe and no sickness or sorrow may enter.
Manannán mac Lir rules Mag Mell, the joyous plain beyond the western sea where the Tuatha Dé Danann feast in eternal youth after ceding Ireland to the Milesians.
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.
Manannan mac Lir gave Lugh the sword Fragarach, 'The Answerer,' which could cut through any armor and compel truth from anyone threatened with its blade.
Manannán mac Lir rode his chariot across the waves to meet Bran mac Febail at sea during the Voyage of Bran, singing of how the ocean that terrified the mortals was to him a flowering plain, and prophesying the birth of his own son Mongán in the mortal world.
Manannán mac Lir shook the Cloak of Manannán between Cú Chulainn and Fand to erase their love, and between Fand and himself to end her grief — severing the bond between mortal hero and Otherworld queen with a single gesture.
Manannán mac Lir lured Cormac mac Airt to the Otherworld by trading a silver branch for the king's wife, son, and daughter, then restored the family and gifted Cormac the Cup of Truth — a vessel that shattered when three lies were spoken over it and became whole again for three truths.
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