From A Wiki of Ice and Fire
|Book||A Storm of Swords (mentioned)|
Robert Stone was a knight mentioned by Ser Osmund Kettleblack.
According to the naming conventions for bastards, Robert must have been a bastard from the Vale.
A Storm of Swords
When Ser Jaime Lannister, Lord Commander of the Kingsguard, returns to King's Landing after months of captivity, he interrogates the new members of the Kingsguard regarding their experience at arms. Ser Osmund Kettleblack tells him he was knighted by Ser Robert on the battlefield and he is now dead. Jaime does not recognize this knight and is dubious about Ser Robert's existence believing Stone was made up by Osmund.
- ↑ A Storm of Swords, Chapter 67, Jaime VIII.