From A Wiki of Ice and Fire
|Book||Fire & Blood (mentioned)|
Ser Dennis Whitfield was a knight of the Kingsguard during the reign of King Aegon III Targaryen.
During the regency of Aegon III, an attempted coup against the Rogare family and the Hand of the King, Lord Thaddeus Rowan, resulted in the deaths of Lord Commander Marston Waters of the Kingsguard and two of his sworn brothers, Ser Mervyn Flowers and Ser Amaury Peake. Ser Dennis, Ser Agramore Cobb and Ser Edmund Warrick were given the white cloaks of the Kingsguard to replace the deceased.
- ↑ 1.0 1.1 Fire & Blood, The Lysene Spring and the End of Regency.