From A Wiki of Ice and Fire
|Book||Fire & Blood (mentioned)|
Ser Denys Oakheart was a knight of House Oakheart during the reign of King Jaehaerys I Targaryen. He was the eldest son and heir of Lord Oakheart.
In 73 AC, Denys took part in a tourney held by his father to celebrate the birth of another son. Denys was defeated by a mystery knight called the Silver Fool, who was later revealed to be Prince Baelon Targaryen.
- ↑ 1.0 1.1 Fire & Blood, The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain.