At Gaddi 's death , he entered the service of the Farnese family .
At Gaddi 's death , he became confidential secretary to Pier Luigi Farnese , Duke of Parma , and to his sons , Duke Ottavio and Cardinals Ranuccio and Alexander .
At Gaddi 's death , he entered the service of the Farnese family , and became confidential secretary to Pier Luigi Farnese , Duke of Parma , and to his sons , Duke Ottavio and Cardinals Ranuccio and Alexander .