In 1547 a conspiracy was arranged against him by counts Francesco Anguissola and Agostino Landi and the marquises Giovan Luigi Confalonieri and Girolamo and Alessandro Pallavicini.
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In the meantime the office of Captain General of the Church had become vacant, and Paul nominated his son on 31 January 1537.
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Pier Luigi and his son, Ottavio, declared they would have pay 9,000 golden ducati every year to the Holy See, and, in exchange, they gave back the Duchies of Camerino and Nepi.
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Gerolama Orsini (1504–1570) sometimes Girolama Orsini was a member of the House of Orsini and the wife of Pier Luigi Farnese, Duke of Parma.
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In 1513 an engagement contract between Orsini and Pier Luigi Farnese was drawn up, and in 1519 the wedding celebrated at Valentano.
On 2 March 1581 she married Vincenzo Gonzaga, the future duke of Mantua, probably with the political aim of creating an anti-Florentine alliance between the Gonzaga and Farnese families, after their long feud since 1547, when Ferrante Gonzaga had organised a plot against Pier Luigi Farnese first duke of Parma and Piacenza.