This historical book is a sequel to Caesar's Commentaries on the Civil War, and it is widely assumed that his lieutenant Aulus Hirtius ghost wrote it. After the battle of Pharsalus, Caesar pursues the defeated Pompey to Alexandria, only to discover that his adversary has been killed by the Egyptians. Caesar later chose to ally himself with Cleopatra, sister of Ptolemy XIII, enduring a siege that resulted in the infamous burning of the library of Alexandria, according to Plutarch. Caesar turned his attention to Asia after winning the Battle of the Nile in 47 BC. The book concludes with Caesar's famous remark 'Veni, Vidi, vici' (I came, I saw, I conquered) after his victory over Pontus at the Battle of Zena.