| Ranuccio II Farnese | |
| Succession: | Duke of Parma and Piacenza |
| Reign: | 11 September 1646 – 11 December 1694 |
| Reg-Type: | Regents |
| Regent: | 1646–1648: Francesco Maria Farnese Margherita de' Medici |
| Predecessor: | Odoardo |
| Successor: | Francesco |
| Birth Date: | 17 September 1630 |
| Birth Place: | Parma, Duchy of Parma and Piacenza |
| Death Place: | Parma, Duchy of Parma and Piacenza |
| Burial Place: | Sanctuary of Santa Maria della Steccata |
| Spouse: | Margaret Yolande of Savoy Isabella d'Este Maria d'Este |
| Issue: | Margherita Maria, Duchess of Modena Odoardo, Hereditary Prince of Parma Francesco, Duke of Parma Antonio, Duke of Parma |
| House: | Farnese |
| Father: | Odoardo Farnese, Duke of Parma |
| Mother: | Margherita de' Medici |
Ranuccio II Farnese (17 September 1630 – 11 December 1694) was the sixth Duke of Parma and Piacenza from 1646 until his death nearly 50 years later. He was also the Duke of Castro from 1646 until 1649.
Ranuccio was the eldest son of Odoardo Farnese, the fifth sovereign duke of Parma, and his Tuscan wife, Margherita de' Medici. After his father's sudden death, Ranuccio succeeded as duke. As he was a minor and had not yet reached his majority, he ruled the first two years of his reign under the regency of his uncle, Francesco Maria Farnese and his mother.
Ranuccio belonged to the House of Farnese, whose duchy were founded by his patrilineal ancestor, Pope Paul III, formerly Alessandro Farnese. The Farnese Dukes had been ruling Parma and Piacenza since Pope Paul's illegitimate son Pier Luigi Farnese was given it as a possession. Pier Luigi was also Duke of Castro, a title he was bestowed upon by his father, after the latter created it from the lands recovered after the death of Ranuccio the Elder, Pier Luigi's younger brother.
During Odoardo's reign the declining Duchy had been involved in the Wars of Castro, over the above-mentioned duchy of Castro, which was a Farnese fief in the Papal States, north of Rome, which the powerful Pope Urban VIII's family, the Barberini, was eager to acquire. They found the excuse when Odoardo was unable to repay his creditors, from whom he had incurred debts. Urban responded to the creditors' plea for help and had Castro occupied. However, the first war ended with Papal defeat.
Ranuccio refused to repay the debts incurred by his father, despite the latter having a signed peace treaty agreeing to do so. He also refused to recognize the new bishop of Castro, appointed by Urban's successor, Innocent X. In 1649, the new bishop, Cardinal Cristoforo Giarda, was murdered on his way to Castro. Innocent accused Ranuccio of the murder and in retaliation, forces loyal to the Pope besieged Castro, and then razed it to the ground. In August of that same year, the Parmense troops had been crushed not far from Bologna, and Ranuccio remained with no means to gain back his fief, despite his attempts to buy it back with money.
In 1672 he bought the principate of Bardi and Compiano from Gianandrea Doria Landi, giving the Duchy its final shape.In the last days of his reign, the Duchy suffered heavily from the presence of Imperial troops, who were fighting in the dispute between Victor Amadeus II of Savoy and France.
Ranuccio II was married three times:
On 29 April 1660, Ranuccio married firstly Marguerite Yolande of Savoy (b. 15 November 1635 – d. 29 April 1663), a daughter of Victor Amadeus I, Duke of Savoy and Christine Marie of France. They had two children:
| Name of child | Lifespan | Marriages and Issue | |
|---|---|---|---|
| unnamed daughter | 14 December 1661 – 14 December 1661 | None | |
| unnamed son | 27 April 1663 – 28 April 1663 | None |
On 18 February 1664 Ranuccio married secondly Isabella d'Este of Modena (b. 3 October 1635 – d. 17 August 1666), a daughter of Francesco I d'Este and his cousin. They had three children:
| Name of child | Lifespan | Marriages and Issue | |
|---|---|---|---|
| Margherita Maria Farnese | 24 November 1664 – 17 June 1718 | Francesco II d'Este, Duke of Modena, no issue | |
| Teresa Farnese | 10 October 1665 – 9 November 1702 | Never Married; Benedictine nun in Sant’ Alessandro Monastery of Parma | |
| Odoardo Farnese, Hereditary Prince of Parma | 12 August 1666 – 6 September 1693 | Countess Palatine Dorothea Sophie of Neuburg, had issue |
| Name of child | Lifespan | Marriages and Issue | |
|---|---|---|---|
| Isabella Francesca Maria Lucia Farnese | 14 December 1668 – 9 July 1718 | Never Married; Benedictine nun in Santa Maria di Campagna Monastery of Piacenza. | |
| Vittoria Maria Francesca Farnese | 24 December 1669 – 15 September 1671 | ||
| Unnamed son | 24 June 1671 – 28 June 1671 | ||
| Vittoria Farnese | 19 November 1672 – 19 November 1672 | ||
| Caterina Farnese | 19 November 1672 – 19 November 1672 | ||
| Unnamed son | 26 December 1674 – 26 December 1674 | ||
| Eleonora Farnese | 1 September 1675 – 3 November 1675 | ||
| Francesco Farnese, Duke of Parma | 19 May 1678 – 26 February 1727 | Countess Palatine Dorothea Sophie of Neuburg, no issue | |
| Antonio Farnese, Duke of Parma | 29 November 1679 – 20 January 1731 | Enrichetta d'Este, no issue |