Publius Crassus
A lost biography of Publius Crassus was written by his Greek secretary Apollonius, who accompanied him on the Parthian campaign but presumably escaped with Cassius. Eight years after the battle, Cicero wrote a letter of recommendation to Caesar on behalf of Apollonius, praising him for his loyalty. Since he was manumitted as a term of Publius's will, he is by Roman custom likely to have taken the name Publius Licinius Apollonius as a freedman. The highly laudatory account of Publius's death found in Plutarch suggests that Apollonius's biography was a source.