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Erc mac Cairpri (modern spelling: Earc) is a character from the Ulster Cycle of Irish mythology. His is the son of Cairbre Nia Fer, king of Tara, and his wife Fedelm Noíchrothach, daughter of Conchobar mac Nessa, king of Ulster. After Cairbre is killed by the Ulster hero Cúchulainn in the battle of Ros na Ríg, Erc is installed as the new king of Tara, is given Cúchulainn's daughter Fínscoth in marriage, and swears allegiance to his grandfather Conchobar. However he later conspires with Lugaid mac Con Roí and others to kill Cúchulainn. He is then killed by Conall Cernach, Cúchulainn's foster-brother, in vengeance. When Conall takes his head back to Tara, his sister Achall dies of grief.
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Irish mythology: the Ulster Cycle
Ulster
Conchobar mac Nessa
Amergin mac Eccit
Athirne
Blaí Briugu
Bricriu
Cathbad
Celtchar
Cethern mac Fintain
Conall Cernach
Cruinniuc
Cú Chulainn
Cúscraid
Deichtine
Deirdre
Fedelm
Fedlimid
Findchóem
Furbaide
Láeg
Leabharcham
Lóegaire Búadach
Mugain
Neas
Naoise
Sencha
Súaltam
Ulster exiles
Cormac Cond Longas
Dubthach Dóeltenga
Fergus mac Roích
Connacht
Medb
Ailill Finn
Ailill mac Máta
Bélchú
Cet mac Mágach
Etarcomol
Ferdiad
Findabair
Flidais
Fráech
Mac Cécht
Nera
Munster
Cú Roí
Conganchnes mac Dedad
Lugaid mac Con Roí
Others
Achall
Aífe
Bláthnat
Conaire Mór
Cairbre Nia Fer
Connla
Dáire mac Fiachna
Emer
Éogan mac Durthacht
Erc mac Cairpri
Fedelm
Fir Fálgae
Garb mac Stairn
Lugaid Riab nDerg
Mesgegra
Nechtan Scéne
Scáthach
Uathach
Supernatural figures
Aengus
Bébinn
Boann
Dáire
Étaín
Fand
Flidais
Lí Ban
Lug
Macha
Manannán mac Lir
Midir
The Morrígan
Nemain
Creatures
Donn Cuailnge and Finnbhennach
Liath Macha and Dub Sainglend
Weapons
Caladbolg
Fragarach
Gáe Bulg
Lúin of Celtchar
Locations
Brú na Bóinne
Cruachan
Cuailghe
Dealga
Dún Flidhais
Eamhain Mhacha
Magh Meall
Teamhair
Texts
Aided Óenfhir Aífe
Compert Con Culainn
Fled Bricrenn
Mac Da Thó's Pig
Mesca Ulad
Scéla Conchobair
Serglige Con Culainn
Táin Bó Cúailnge
Táin Bó Flidhais
Tochmarc Emire
Tochmarc Étaíne
Togail Bruidne Dá Derga
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