I wasn't familiar with any stories about Cleopatra's children, so this was quite interesting. I can't imagine what Selene went through just trying to survive. It would be bad enough to lose both of your parents to suicide, but to lose your siblings, including a twin, would be almost to bare. I may have to see if I can find any more about her life.

Selene grew up in a palace on the Nile under parents Cleopatra and Mark Antony - the most brilliant, powerful rulers on earth. But when a cruel Roman Emperor takes the country and whisks the princess to Rome against her will. She finds herself torn between two young men and two possible destinies - until she reaches out to claim her own.
Goodreads.