Ottavio Farnese, Duke of Parma
…Piacenza (eldest son of Pope Paul III) by his wife Gerolama Orsini. Ottavio's brother was Cardinal Ranuccio Farnese. On 4 November 1538 Ottavio married Margaret of Austria, the illegitimate daughter of Charles V, Holy Roman Emperor. Ottavio was 14 years old, while Margaret, recently widowed by the death of Alessandro de…