There are many rulers throughout history who have killed their fathers, making it difficult to give a definitive answer without more context. Here are some examples:
- Roman Emperors: Several Roman emperors, such as Nero, Caligula, and Commodus, are known for killing their fathers to secure their own power.
- Ancient Egypt: Ramesses III was allegedly killed by his own son, Amenmose, in a plot to seize the throne.
- Medieval Europe: Richard III of England was accused of murdering his nephews, the young princes Edward V and Richard of Shrewsbury, to claim the throne.
To provide a more specific answer, it would be helpful to know which time period, geographical location, or specific dynasty you are interested in.