House Reyne of Castamere is a house of the Westerlands which is at present extinct. They were formerly sworn to House Lannister of Casterly Rock. Castamere was their home and seat of power.
When they existed, for a time House Reyne seconded House Lannister in terms of wealth. However, they were not content with being the second wealthiest family nor could be the first. Out of jealousy one of the Lords built a castle as grand as Casterly Rock and gave his wife jewelries to wear which were bigger than any of the Lannister’s wives ever wore. Continuing these even when their mines ran dry, eventually House Reyne found themselves slowly sinking into the muck. Without gold, they turned to a more common source of wealth; daughters.
They started to marry their daughters off to the Lannisters to regain wealth and status by creating dispute among them. The Lady Ellyn Reyne was at first betrothed to Tywald Lannister. But after Tywald’s death in a battle, she seduced his Younger brother Tion Lannister. Tion who was already betrothed to another woman married Ellyn Reyne. But he also followed his elder to the grave while in another battle. This time Ellyn flung herself to the heir to the Casterly Rock, Tytos Lannister inspite of him being married. But Tytos ran away to his wife and told her about the desires of Ellyn. At last, Lady Ellyn was married to Walderan Turbeck though the marriage didn’t contribute to the amplification of wealth or status for House Reyne as House Turbeck themselves were a failing house.
Both the House Tarbeck and Reyne would have sunken into the abyss together. But to their rescue, Tytos Lannister became the Lord of Casterly Rock. He granted the Tarbecks and the Reynes an outrageous amount of loan. After a while, Tytos went to Roger and Reynard Reyne to ask for repayment. In reply, they laughed at him untill Tytos himself was laughing along.
In the meantime, Tywin Lannister returned from the war of the ninepenny kings. Upon his return he called for immediate repayment of all the debts to Casterly Rock. Reynard Reyne laughed at the action and Walderan Tarbeck took it even a step farther. He rode for Casterly Rock to scare the Lannisters away but instead he was imprisoned by Tywin. Lady Reyne protested and the Reynes declared war. In response cowardly Tytos apologized and released Lord Tarbeck. Moreover, as a compensation, he forgave all the debts of Tarbecks to the Lannisters. Lord Roger Reyne arranged a feast at Castamere to celebrate this new friendship which according to him would ‘last eternity’.
However, eternity lasted only a year. Tytos continuously being feeble and unworthy House Reyene claimed that the Lannister’s rule over the westerlands has come to an end. They openly revolted against House Lannister. Tywin Lannister grabbed the opportunity and crushed the Houses Tarbeck and Reyne literally into the ground.
Like the Casterly rock, the seat of House Reyne had begun as a mine. After dishing out the golds, they widened the mine-shafts. Deep beneath the earth halls, galleries and bed-chambers were made from them. When Tywin attacked the Reyne brothers did not have the men to defend the castle halls. So, they retreated into their underground stronghold. Tywin Lannister sealed the gates and doors until there was no way in or out. He also hanged the corpses of the slain Reynes from the gates of the Casterly Rock. He put them for public display and left them to rot all summer.
The annihilation of House Reyene is immortalized in the song “The Rains of Castamere.”