Following Ned’s execution, Joffrey, Robert’s first son, sits the throne as his successor. Meanwhile, before his demise, Ned managed to send a letter to Stannis Baratheon, informing that three of Cersei’s children aren’t Robert’s legitimate offspring. Which means that Robert’s direct brother is the rightful heir and not Joffrey. A following dispute then begins as to which brother should inherit the throne since Robert has two living brothers, Stannis and Renly. Should words not solve the dispute, both Stannis and Renly promise that blood will.