Three more 'Game of Thrones' spinoffs in works at HBO

According to the courses, HBO is developing three new Game of Thrones spinoff shows, including one from the creator of another period epic drama series.

One of the spinoffs, called '9 Voyages' or 'Sea Snake,' comes from 'Rome' co-creator Bruno Heller, while the other two, 'Flea Bottom' and '10,000 Ships,' have yet to find writers.

Lord Corlys Velaryon, also known as the 'Water Snake,' is the head of House Velaryon and the husband of Rhaenys Targaryen on the Sea Snake vessel in '9 Voyages.' Lord Corlys, Westeros' most famous adventurer, built a mansion far wealthier than the Lannisters and claims the world's largest navy.

'Flea Bottom' is set in King's Landing's poorest district, while '10,000 Ships' is about Princess Nymeria, who traveled to Dorne with the Rhoynar and married Lord Mors Martell.

These projects are in the wake of another 'Game of Thrones' prequel, 'House of the Dragon,' which has already cast Paddy Considine, Olivia Cooke, Emma D'Arcy, and Matt Smith, as well as Steve Toussaint, Rhys Ifans, Eve Best, and Sonoya Mizuno. King Viserys Targaryen will be played by Considine, with Smith portraying his younger brother Prince Daemon Targaryen and D'Arcy portraying Princess Rhaenyra Targaryen.

Although little is known about the three series in production, Toussaint has been cast as Velaryon in 'House of the Dragon,' presumably working for two more series based on George R.R. Martin's fictional world. Best, who plays his wife and dragonrider Princess Rhaenys Velaryon, has been cast in the same role (Nee Targaryen).