The ruler of the Red Branch of Ulster, this Irish king's country was safe as long as his nephew Cuchulain remained alive.  
One myth said that he died in a fit of rage upon hearing of Christ's crucifixion, and another asserted that his mother, Nessa, carried him three years and three months before his birth.  His enemies, Ailill and Mebd took advantage of his magical weakness and almost took the Brown Bull of Cualgne back to Connaught.  The ruler of the Red Branch of Ulster, this Irish king's country was safe as long as his nephew Cuchulain remained alive.  FTP, identify this king of Irish myth who killed the sons of Usnach after they had absconded with his bride Deidre.
One myth said that he died in a fit of rage upon hearing of Christ's crucifixion, and another asserted that his mother, Nessa, carried him three years and three months before his birth.  
Conchobar