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The Thanedd coup occurred during a planned mages' reunion on the island. The banquet preceding the reunion began quietly enough with mages discussing their alliances with either the Northern Kingdoms or Nilfgaard, or professing neutrality but things soon began to heat up.
Mages employed by Nilfgaard, led by Vilgefortz, had planned a sneak attack on their northern counterparts. The entrance from the interior of the hollow island to Garstang was opened by Francesca Findabair revealing an army of Scoia'tael who had been secretly transported to the island to take part in the coup by Cahir Mawr Dyffryn aep Ceallach, Rience and Faoiltiarna.
Γιενέφερ had brought Ciri to the proceedings and Cahir and Rience had hoped to capture the girl there. Cahir nearly did, but Ciri was able to defeat him in a sword fight and flee. Γκέραλτ then nearly killed Cahir as well, but relented at the last moment when the knight revealed that he had been the one who had saved Ciri during the Slaughter of Cintra.
At the end of the skirmish, Γκέραλτ then met and fought Vilgefortz but the mage was far more skillful than the witcher had anticipated. Vilgefortz seriously wounded Γκέραλτ, but did not kill him (although he easily could have). Instead, the mage told him that this encounter had been a "little lesson" and then fled, presumably still trying to get Ciri. Triss Merigold then found the witcher and transported him to Brokilon with the help of Tissaia de Vries.
Following the coup, confidence in mages seriously declined and many of them were expelled from the royal courts. It is also cited as one of the precipitating events of the war that followed.