From A Wiki of Ice and Fire
|Book||The Mystery Knight (mentioned)|
Ser Mortimer Boggs was a knight from House Boggs during the reign of Aerys I Targaryen.
Mortimer was a knight of some repute.
Ser Mortimer attended the Whitewalls tourney in 212 AC. He was defeated in the lists by Ser Glendon Flowers. He refused to send over his horse and the armor he sent over had holes punched through it.