How Did Cersei's Children Die on Game of Thrones?
Game of Thrones: How, When, and Why Each 1 of Cersei's Children Died
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With his brother Joffrey dead, young Tommen becomes the new king. Despite his young age, the good-natured Tommen attempts to be a good and fair king, although more often than not he's being pushed in one direction or another by Cersei or by Margaery. He marries Margaery, but soon realises the limits of his power when the Faith Militant make a play (empowered by Cersei), arresting both Margaery and her brother Loras — then, eventually, Cersei herself.
Tommen is able to free Margaery, and attempts to forge an alliance between the throne and the Faith Militant. He promises a "real" trial to Cersei and Loras, rather than a trial by combat. However, Cersei has other plans and blows up the Sept with wildfire, killing all the Tyrells and most of the high-ranking members of the Faith Militant. Horrified at the loss of all he holds dear (and the knowledge that Cersei was behind it), he takes off his crown and jumps to his death from his bedroom window.