Kinslaying is a great taboo in Westeros. When a member of family kills a relation he/she is dubbed a Kinslayer. Any individual who slays a member of their own family is believed to be cursed by the gods. Many Lords and smallfolk believe this and thus those who slay their own blood are usually looked down upon or shunned. There is a saying...
"Old Gods or New, it makes no matter, No man is so accursed as the Kinslayer".
Sometimes in extreme circumstances Kinslayers are even executed as punishment for their deeds.
People accused or suspected of kinslaying
- Tyrion Lannister: accused of the murder of his nephew, King Joffrey I, of which he's actually innocent. Also held responsible for the murder of his own father, Tywin Lannister, of which he is actually guilty.
- Gregor Clegane: is rumored to have murdered his own father and sister.
- Ramsay Bolton: his own father, Roose Bolton, suspects he poisoned his half-brother Domeric, Roose's trueborn son.
- Stannis Baratheon: for killing his brother Renly Baratheon with a shadow assassin (although it could have been Melisandre who is solely responsible for Renly's murder, as Stannis has consistently denied knowledge of it). When the shade of Renly Baratheon appears during the Battle of the Blackwater - actually Ser Garlan Tyrell wearing the dead Renly's armor - many men believe that the ghost of Renly returned to get revenge on his kinslaying brother.
- Craster: for sacrificing his male children to the Others.
- Robb Stark: when preparing to execute Rickard Karstark, per Eddard Stark's custom that the man who passes the sentence should also swing the sword, Karstark calls Robb a kinslayer due to the (distant) blood ties between Starks and Karstarks.
- Euron Greyjoy: Is suspected of hiring an assassin, probably a Faceless Man, to kill his older brother Balon Greyjoy.
- Harlan Hunter: According to Petyr Baelish, Harlan murdered his own father Eon Hunter and is also planning on murdering his elder brother Gilwood Hunter.
- Gilwood Hunter: believed to have murdered his own father Eon Hunter; but see above.
- Theon Greyjoy: named a kinslayer by some for his supposed murder of Bran and Rickon Stark, as he was their father's ward, although they are not his blood kin.
Historical Kinslayers or suspected of Kinslaying
- Brynden Rivers: Was called a Kinslayer when he killed his half-brother Daemon Blackfyre during the Battle of the Redgrass Field.
- Maelys Blackfyre: Was called a kinslayer because he supposedly consumed his own twin in the womb.
- Maekar I Targaryen: Was called a kinslayer when he slew his own brother Baelor "Breakspear" Targaryen (although it was an accident).
- Viserys II: Was suspected of poisoning his own nephew Baelor the Blessed. Though the evidence on this is dubious and it appears most likely that Viserys was innocent of this charge.
- King Aegon II: For feeding his half sister Rhaenyra Targaryen to his dragon during the Dance of the Dragons.
- Ser Erryk: For slaying his twin brother Ser Arryk during the Dance of the Dragons, both died by each others swords.
- Ser Arryk: For slaying his twin brother Ser Erryk during the Dance of the Dragons, both died by each others swords.
- Lord Stark (grandson of Brandon the Daughterless): Slew Bael the Bard, the King-Beyond-the-Wall, ignorant that he was his actual father.
Customs for additional information on customs and traditions of Westeros.