Robin Massey was a knight from House Massey and was briefly made Lord Commander of the Kingsguard during the regency of King Aegon III Targaryen.
After the death of Ser Willis Fell and two other members of the Kingsguard from the Winter Fever in 133 AC, King Aegon III Targaryen bestowed white cloaks on Ser Robin and Ser Robert Darklyn, making Robin Lord Commander of the Kingsguard, thereby passing over the second-in-command, Ser Marston Waters.
However, the king's regent, Lord Unwin Peake, with the support of Grand Maester Munkun, dismissed all the king's appointments on the grounds that no boy of twelve had the judgment to decide such weighty matters himself. Marston Waters was then confirmed as Lord Commander of the Kingsguard. The king protested the dismissal of the Kingsguard knights, saying they served for life, but Lord Peake replied that was only when they had been properly appointed.
Tessario the Tiger later slew Robin in a dispute over a horse both men wished to buy.