Why did Cleopatra kill her siblings?

Related questions

1. Why was Cleopatra so famous?
2. Why did Cleopatra marry her brothers?
3. Where did Cleopatra get bitten?
4. What happened to Cleopatra's daughter?
5. What did Cleopatra VII do?
6. Did Cleopatra die by a snake bite?
7. When did Cleopatra rule Egypt?
8. What happened to Queen Cleopatra's son?
9. Who Killed Cleopatra husband?
10. Did Caesar have a baby with Cleopatra?

Tags

1. #brother
2. #cleopatra
3. #execution
4. #ruler
5. #rival
6. #younger
7. #murdered
8. #following
9. #engineered
10. #sister
11. #believed
12. #arsinoe
13. #considered
14. #throne
15. #remarried
16. #ptolemy