Kingslayer is a common nickname for Ser Jaime Lannister of the Kingsguard. The name refers to his slaying of Aerys II Targaryen, the Mad King, during the Sack of King's Landing. Since Jaime was supposed to be guarding Aerys and betrayed his oath as a Kingsguard to carry out the attack, the term is usually meant perjoratively.

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