Deirdre is a heroine of Irish legend, known for her tragic story. She was the daughter of the king of Ulster and was said to be so beautiful that kings and warriors fought over her. She eventually married Naoise, one of the sons of Uisneach, and they lived happily until she was forced to marry Conchobar, the king of Ulster. Deirdre's story is one of the most famous in Irish mythology and has been told in many different versions.