Queen Ceryse Hightower

Her maternal uncle was one of the High Septons during the reign of Aegon the Conqueror. Regarding her death, the official version for cause of death was a sudden illness, but it was rumored she had said something to offend Maegor the Cruel and he ordered Ser Owen Bush of the Kingsguard to remove her tongue. While Ser Maladon Moore held her, Ceryse allegedly struggled so much that Owen's knife slipped and he accidentally slashed her throat. https://awoiaf.westeros.org/index.php/Ceryse_Hightower