This was history's first documented incident of fratricide (Geoffrey Regan, Back Fire, Robson Books Ltd., London, 1995).
Kenneth II of Scotland, nicknamed "The Fratricide", (before 954–995), King of Scotland
He was assassinated in Peñalén, whence his nickname, by a conspiracy headed by his brother Ramón (el Fratricida, the Fratricide) and his sister Ermesinda.
Eventually, Yahya's two older brothers died, but in 1603, since Yahya had escaped the country to avoid fratricide, his younger brother Ahmed I (the fourth-born) became Ottoman sultan.