- "I, Tywin Lannister, led the assault on Castamere to put down this rebellion."
- ―Tywin Lannister
Castamere was destroyed by Ser Tywin Lannister when House Reyne rose in rebellion against him. Although the castle was destroyed; it is immortalized in the song The Rains of Castamere. By the end of the rebellion, Castamere was left in ruins and all members of House Reyne were executed.
Queen Cersei tells Margaery Tyrell about the destruction of Castamere and House Reyne in order to intimidate her. She implies that if House Tyrell ever rebels against House Lannister, they will suffer a similar fate.
In the books
In the A Song of Ice and Fire novels, Castamere is located near Tarbeck Hall, seat of House Tarbeck, and the Crag, seat of House Westerling. It is rich in gold mines, which were captured by Greatjon Umber following the Battle of Oxcross. Following the Red Wedding, Castamere is awarded to House Spicer, the maternal family of Robb Stark's Queen, Jeyne Westerling, for their part in the fall of the King in the North.
The World of Ice and Fire sourcebook (2014) reveals that Castamere, like Casterly Rock, started as a mine. As the ores were mined out, the Reynes converted the tunnels into a splendid underground residence, with only a modest castle and fortification above ground, but with grand galleries and rooms beneath the surface. This made the holdfast theoretically very capable of surviving long sieges – provided the goal of any attackers was to take hostages or seize the castle itself. Since Tywin was more than willing to exterminate the Reynes completely, he simply flooded Castamere through its air ducts, drowning everyone within. Although the sourcebook doesn't say what happened to Castamere after that, it must have been drained and made habitable again for it to be granted to the Spicers.
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