Lord of Kingsgrave is a title held by the head of House Manwoody, the ruler of Kingsgrave in Dorne.
Lord Dagos Manwoody accompanies Prince Oberyn Martell to King's Landing.
Dagos is present when Tyrion comes to see Oberyn on the day of his trial by combat, helping the prince don his battle armor.
Dagos is present at the feast when Ser Balon Swann arrives in Sunspear to deliver the Mountain's skull. He refuses to drink when Ricasso raises a toast to King Tommen I Baratheon.