The two men had never been on friendly terms, and their relationship worsened after Cicero made it clear that he felt Antony was taking unfair liberties in interpreting Caesar's wishes and intentions. When Octavian, Caesar's adopted son and heir, arrived in Italy in April, Cicero formed a plan to play him against Antony.[3] In September Cicero began attacking Antony in a series of speeches he called the Philippics, in honour of his inspiration, Demosthenes. In praise of Octavian, he labelled him a "god-sent child" and said that the young man desired only honour and would not make the same mistake as did Caesar.