Morath
Morath was a Klingon mytho-historical figure and the brother of Kahless the Unforgettable. 

According to legend, Morath dishonored himself and his family by telling a lie and/or breaking his word. Kahless challenged him to battle but Morath was a coward and fled. Kahless pursued him across valleys and over mountains, to the edge of the sea. There, Kahless fought Morath for twelve days and twelve nights. ()

Again, according to legend, Morath murdered his father over a sword. As Kahless held their dead father, Morath threw the sword into the sea, saying, "If he could not possess it, neither would Kahless." This was the last time the two brothers spoke to each other. ()

However, Kahless later descended into Gre'thor to redeem Morath and bring him to Sto-vo-kor. ()

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Klingons
Mythological figures