A king with this name had a son named Crimthann whose mother  was kidnapped by Flann.
A king with this name had a son named Crimthann whose mother  was kidnapped by Flann. That king's unfaithful spouse, Becfhola, has her  tale told in a namesake wooing. A prince of this name warred against  Tairdelbach Ua Conchobair when his love Derforgaill was taken from  him. This name is also held by a figure that slept with his lover on 366  dolmens that came to be known as his namesake beds. That man of this  name had eloped with a woman that killed (*) Searbhan while they were  getting a ride from him, but this man was ultimately found when a friend of  his played Fidchell with Fin MacCool. For 10 points, give the name of a warrior  who had a magical love spot on his forehead.
A king with this name had a son named Crimthann whose mother  was kidnapped by Flann.
Diarmait [or Dermot or Diarmuid]