"Pier Luigi Farnese (19 November 1503 – 10 September 1547) was the first Duke of Castro from 1537 to 1545 and the first Duke of Parma ...
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and Piacenza from 1545 to 1547.
Born in Rome, Pier Luigi was the illegitimate son of Cardinal Alessandro Farnese (who later became Pope Paul III). He became a soldier and participated in the sack of Rome in 1527." - (en.wikipedia.org 10.08.2021)