Blaí Briugu (Blaí the Landholder or Hospitaller) is an Ulster warrior in the Ulster Cycle of Irish Mythology.
He was wealthy and kept a hostel, and had a geis which required him to sleep with any woman who stayed there unaccompanied.
[1] When Brig Bretach, wife of Celtchar, stayed there on her own, he slept with her (as required by his geis) and for that Celtchar killed him.
[2]