Mark Antony's speech at the Senate House in Act III Scene II appealed to the values and emotions of the Roman public to ignite a rebellion against the conspirators. A key element of his rhetoric centred on Julius Caesar's will; seventy-five drachmas were to be issued to each citizen. It was the generosity of Caesar that Mark Antony used to persuade a mutiny.
Ironically, in the privacy of his home, Antony commands Lepidus to "fetch the will" to "determine how to cut off some charge in legacies." He wants to realise the funds in Caesar's will to raise and army against Brutus and Cassius.
Here Antony is presented as manipulative and avaricious, which contrasts the loyal Tribune the audience was first introduced to. His ascension was made possible by offering to honor Caesar's will, a promise which he obviously has no intention in fulfilling.
From his speech in the Capitol to the end of the play, Mark Antony is confident, ambitious, successful and ruthless. He displays no concern for the Roman citizens as they suffer in the civil upheaval, he is willing to execute a nephew instead of argue for his life, and he only upholds the bare minimum of Caesar's legacy to maintain totalitarian control over the Roman Empire.