what castle was on fire during episode 1 hotd season 3

The castle on fire was High Tide , Corlys Velaryon’s seat at Driftmark. NPR’s recap notes that the episode includes a threat to “burn his castle High Tide to the ground,” which matches the fire you’re asking about.

Why that’s the one

• The episode coverage centers on the Battle of the Gullet and related chaos, not a different castle burning.

• Other recaps also place the action around Dragonstone, Driftmark, and the sea battle, which points to High Tide rather than Harrenhal or King’s Landing.

Quick note

Some discussions online mix up castle names because the episode moves fast, but the burning sequence tied to Corlys is the clearest match.

Would you like a 2-line recap of the whole episode too?