Inside the Triarchy: the pirate syndicate fuelling House of the Dragon’s deadliest sea battle

House of the Dragon is back after a two-year breather, and it does not ease you in. Season three opens by dropping the deadliest sea fight Westeros has ever seen: the Battle of the Gullet. A massive pirate armada roars into that narrow waterway, sets it ablaze, and blindsides Corlys 'Sea Snake' Velaryon’s blockade. The result: wrecked fleets, wrecked plans, and a lot of people in King’s Landing suddenly realizing their trade lifeline just got cut to the bone.

The attackers are the Triarchy — the same thorn that has needled Daemon Targaryen and Corlys for decades. They are back in force, and they picked their moment well, right in the middle of the Dance of the Dragons. If you are wondering who exactly these people are and why everyone from Driftmark to the Red Keep is panicking, here’s the quick lay of the land.

So, who are the Triarchy?

• The basics: it’s an alliance of three of the Nine Free Cities of Essos — Lys, Myr, and Tyrosh.
• Also known as: the Kingdom of the Three Daughters. In Westeros, folks shorthand them as daughters of Old Valyria because all three grew out of Valyrian colonial outposts.
• When they linked up: around 96 AC, which the story places roughly seven years before the events we see in House of the Dragon kick off.
• Their first big move: they teamed up to beat Volantis in the Disputed Lands, a fight that shifted the regional balance of power.
• What that win bought them: leverage over key Narrow Sea trade routes — exactly the arteries that keep King’s Landing fed and paid.
• How they operate: they may be city-states, but when it suits them, they sail like pirates. Hence the shock-and-awe fleet lighting up the Gullet.
• Why our characters care: Daemon and Corlys have been dealing with these people for years, and the Triarchy has a habit of showing up precisely when it hurts most.

Which brings us back to that opening ambush. In the thick of the Dance of the Dragons, the Triarchy sails straight into the Sea Snake’s net and flips it, turning the Gullet into a floating graveyard. It’s brutal, it’s strategic, and it sends a very loud message across the Narrow Sea: the Three Daughters are not just back — they are here to choke the realm’s commerce and make Westeros bleed for it.