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.
Nilfgaardian mages had planned a sneak attack on their northern counterparts. The entrance to the interior of the island 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.
Yennefer 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. Geralt then nearly killed Cahir as well, but relented at the last moment when the knight said that he was the one who had saved Ciri during the Slaughter of Cintra.
At the end of the skirmish, Geralt then met and fought Vilgefortz but the witcher was seriously wounded and the mage fled, presumably still trying to get Ciri. Triss Merigold then transported the witcher to Brokilon.
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.
Participants
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Fatalities of the coup
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