|Robb Rivers[N 1]|
Fighting on the side of the blacks, Robb brought three hundred archers to the Battle by the Lakeshore during the Dance of the Dragons. Caught by armies from the riverlands and the north, Lord Humfrey Lefford sent ravens to Prince Aemond Targaryen at Harrenhal for assistance. However, Robb used his archery to prevent any of the ravens from reaching Aemond. Robb and two of his archers later slew Ser Criston Cole during the Butcher's Ball.
—writings of Gyldayn
It is unknown how Robb is related to the other members of House Blackwood.
- Robb Rivers did not have known personal arms, but it is possible that he, like other highborn bastards, used his father's house sigil with reversed colors.
- Robb and his archers were positioned on the town walls during the First Battle of Tumbleton before the Two Betrayers burned it. In the aftermath of the Second Battle of Tumbleton, Billy Burley was considered the best archer in Lord Benjicot Blackwood's service despite Robb fighting for his family and being considered the best archer in Westeros. Therefore, Robb likely died during the First Battle of Tumbleton.
- Fire & Blood, The Dying of the Dragons - Rhaenyra Triumphant.