Fedelmir’s daughter, Conchobar’s bard. As soon as she was born a malefic prophecy has be told. Her name means " danger ". She was brought up by Leborcham the magician. After having a vision, she decided to have Naoise as a husband, but he refused because he knew that Conchobar wanted Deirdre for wife. Deirdre put a spell on Naoise and he had to rapt her. Naoise was killed by Eogan. Conchobar gave Deirdre to Eogan. Deirdre let fall herself from the chariot which brought her out of Ulster and she died.

Deirdre or Derdriu is the foremost tragic heroine in Irish mythology. Her story is part of the Ulster Cycle.

"Deirdre" is a song written by Bruce Johnston and Brian Wilson for the American pop band The Beach Boys. It was released on their 1970 album Sunflower. It was also released as the B-side of the "Long Promised Road" single.