Which Families Are in House of the Dragon?
"House of the Dragon" Episode 3 Introduces the Lannister Twins
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House Strong is another house with a significant presence in "House of the Dragon." When the series begins, Lord Lyonel Strong is King Viserys's master of laws. His children are also present in King's Landing and the Red Keep, including Ser Harwin Strong, who serves in the gold cloaks, and Larys Strong, who is a quiet observer of everything that goes on.
Their House seat is the notoriously cursed Harrenhal, so it's not surprising that by the events of "Game of Thrones," the House has died out.