Wikipedia
Fráech (Fróech, Fraích, Fraoch) is a Connacht hero in the Ulster Cycle of Irish mythology. He is the nephew of Boann, goddess of the river Boyne, and is renowned for his handsomeness. He belongs to the Fir Domnann.
He seduces Findabair, daughter of Ailill and Medb. When he refuses to pay an exorbitant bride-price for her, however, her parents send the unsuspecting young man on an errand near the dwelling place of a water monster. He slays the monster with the help of Findabair, but is himself severely wounded. A hundred and fifty maidens of the Sidhe, all dressed in green, carry him off and bear him back the following morning, fully healed. He then agrees to fight for Medb against the Ulstermen in the Táin Bó Cuailnge (Cattle Raid of Cooley).
He woos Treblann, granddaughter of Aengus of the Tuatha Dé Danann and foster-daughter of Cairbre Nia Fer, despite the interference of Midir.
When his cattle are stolen and his wife abducted, Fráech tracks them down to the Alps and recovers them with the help of Conall Cernach.
In the Táin Bó Cuailnge, he is drowned in a river in single combat with Cúchulainn. His body is borne away by a hundred and fifty maidens of the Sidhe, all dressed in green.
The mound of Carnfree ( Irish Carn Fraoich, Fráech's Cairn) near Tulsk in County Roscommon, which was used for the inauguration of the O'Connor kings of Connacht, preserves his name. The cave of Cruachan (Oweynagat meaning "cave of the cats") nearby contains an ogham inscription in primitive Irish reading VRACCI MAQI MEDVVI, (the cave) of Fráech son of Medb.
Fraoch is also the name of the heather ale of the Picts.