According to legend, as repeated by Worf, Morath killed their father over the possession of his sword, and after doing so, "Kahless held his father's lifeless body in his arms." After this, Morath "threw their father's sword into the sea, saying, 'if he could not possess it, neither would Kahless.' That was the last time the brothers would speak." The story continued that "Kahless looked into the sea and wept, for the sword is all he had left of his father." (TNG: "Birthright, Part II")
According to deleted lines from "Barge of the Dead", which fleshed out the legend of Kortar more fully, her name was Shelka. According to B'Elanna Torres, "I remember the myth of Kortar and Shelka. The very first Klingons. Their love for each other was so strong they destroyed the gods who create them." Kortar continued the story, "As punishment I was condemned to ferry the damned souls of the dishonored to Gre'thor. And Shelka..." then continued B'Elanna, "Cursed to walk the living world forever. 'And the two Klingon hearts would never meet again. Forever separated by that which distinguishes life from death.' It was my favorite fairy tale."