Odoardo Farnese, Duke of Parma

Duke of Parma and Piacenza from 1622–1646

Odoardo Farnese (28 April 1612 – 11 September 1646), also known as Odoardo I Farnese to distinguish him from his grandson Odoardo II Farnese, was Duke of Parma, Piacenza and Castro from 1622 to 1646.

Odoardo was the eldest legitimate son of Ranuccio I Farnese and Margherita Aldobrandini. After Ranuccio's natural son and his potential rival, Ottavio, was relegated in a prison, he reigned initially under the regency of his uncle Odoardo Farnese and, after the latter's death, of his mother, Margherita Aldobrandini. He came of age in 1628 and in the same year he married Margherita de' Medici, Grand Duke of Tuscany Cosimo II de' Medici's daughter. His first notable act as Duke was an alliance with France in 1633, a move designed to counter Spanish predominance in northern Italy and support his territorial ambitions. He also asked for loans to improve the army, but his first campaigns were ineffective: Piacenza was occupied by the Spanish troops, and his army was defeated by Francesco I d'Este. Spanish troops overran the duchy and devastated the countryside, but did not attempt to lay siege to the cities. In the absence of French assistance, Odoardo was convinced by Pope Urban VIII to sign a treaty of peace with Spain in 1637. Instead of reconciliation, he sought alliances with Venice, Florence and the Duchy of Modena, and invaded northern Lazio with 7,000 troops. His army was composed mostly of cavalry, and were unable to recover Castro by siege. Although the Farnese fleet was destroyed and the Duke often proved recalcitrant, in the peace of 1644, the city of Castro was returned to him and Odoardo was reconciled with the Roman Catholic Church and readmitted to the Sacraments. Odoardo died suddenly in Piacenza, his favorite residence, on 11 September 1646.