George R.R. Martin, the author of Game of Thrones books, broke the news on his blog. According to Martin, Fabien Frankel will play Ser Criston Cole.
"He is the common-born son of the steward to the Lord of Blackhaven," Martin wrote. "He has no claim to lands or titles, all he has is his honor and his skill with sword and lance. He is a challenger, a champion, cheered by the commons, beloved of the ladies. He is a lover (or is he?), a seducer (or is he?), a betrayer (or is he?), a breaker of hearts and a maker of kings ... Welcome to Westeros, Fabien. And do keep that sword sharp."
In the book Fire & Blood, Ser Criston Cole is a member of King Viserys I Targaryen's Kingsguard and a key player in the Targaryen civil war known as the Dance of the Dragons.
The British actor's first feature acting project was the romantic comedy Last Christmas with Game of Thrones star Emilia Clarke.
House of the Dragon is set 300 years before Game of Thrones, and it focuses on the epic civil war known as The Dance of the Dragons.
The series will begin filming in the UK in April. Paddy Considine will star as King Viserys Targaryen, Matt Smith will portray Prince Daemon Targaryen, Emma D’Arcy will star as Princess Rhaenyra Targaryen, and Olivia Cooke will portray Alicent Hightower. The series is from co-showrunners Miguel Sapochnik and Ryan Condal.
House of the Dragon is aiming for a 2022 premiere.