 Suetonius "Caligula" 23, relates how he might have poisoned her.When his grandmother Antonia asked for a private interview, he refused it except in the presence of the prefect Macro, and by such indignities and annoyances he caused her death; although some think that he also gave her poison.After she was dead, he paid her no honour, but viewed her burning pyre from his dining-room.Antonia died on 1 May 37.