Ferrante II Gonzaga, Duke of Guastalla
Ferrante II Gonzaga (1563 – 5 August 1630) was Count of Guastalla and, from 1621, Duke of Guastalla.
He was the son of Cesare I Gonzaga, Count of Guastalla and Duke of Amalfi, and Camilla Borromeo.
He succeeded his father in 1575.
On 2 July 1621, the County of Guastalla was elevated to a Duchy and Ferrante was subsequently deemed a Duke.
Ferrante played a part in the War of the Mantuan Succession when, as a distant Gonzaga cousin, he claimed the Duchy of Mantua after the extinction of the senior male branch of the House of Gonzaga in December 1627.
He was nominally supported by Habsburg Emperor Ferdinand II, who really sought to re-attach the Duchy of Mantua to the Holy Roman Empire.
His attempt failed as the French candidate Charles of Nevers became the new Duke.
Vincenzo Gonzaga, Duke of Guastalla
Vincenzo Gonzaga (1634 – 28 April 1714) was a Duke of Guastalla.
Vincenzo was the son of Andrea Gonzaga, Count of San Paolo, and grandson of Ferrante II Gonzaga, Duke of Guastalla.<br>
After a childless first marriage, he married Maria Vittoria Gonzaga (1659–1707), the youngest daughter of his cousin, Duke Ferrante III Gonzaga of Guastalla.
When Duke Ferrante III of Guastalla died in 1678 without a male heir, Guastalla was ruled by Ferdinando Carlo, Duke of Mantua, who had married Anna Isabella Gonzaga, Duke Ferrante III's oldest daughter.<br
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Vincenzo became Duke of Guastalla in 1692.
Vincenzo and Maria Vittoria had three children :
Vincenzo Gonzaga inherited in 1707 Bozzolo and Pomponesco, and in 1710 Sabbioneta.
Giuseppe Gonzaga, Duke of Guastalla
Giuseppe Gonzaga( 20 March 1690 – 16 August 1746) was the last Duke of Guastalla.
He was the second son of Vincenzo Gonzaga, Duke of Guastalla and Maria Vittoria Gonzaga, and was mentally handicapped .<br>
When his elder brother Duke Antonio Ferrante died in an accident in 1729, Giuseppe was the only remaining male member of the Gonzaga family, so he became Duke.
Giuseppe would probably never have married, but when he became Duke a marriage was arranged in 1731 with the sixteen- year- old Eleonore von Holstein( 1715 – 1760), daughter of Duke Leopold of Schleswig- Holstein- Sonderburg- Wiesenburg, and granddaughter of Karolina of Legnica- Brieg.
The marriage remained childless.
During the War of Polish Succession the Duchy was occupied by the French for four years, between 1734 and 1738.
When Giuseppe Gonzaga died in 1746, Italy was again a theater of war in the War of Austrian Succession, and the Duchy was annexed by Austria.
Two years later, in the Treaty of Aix- La- Chapelle, Guastalla was ceded to the Spanish, together with the Duchy of Parma and Piacenza, with which it was merged.
Antonio Ferrante Gonzaga, Duke of Guastalla
Antonio Ferrante Gonzaga (9 December 1687 – 16 April 1729) was Duke of Guastalla.
He was the son of Vincenzo Gonzaga, Duke of Guastalla and Maria Vittoria Gonzaga.<br
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His sister was Eleonora Luisa Gonzaga, sister in law to Cosimo III de' Medici, Grand Duke of Tuscany.
He succeeded his father in 1714.
He was engaged to Maria Karolina Sobieska, granddaughter of John III Sobieski but Maria Karolina (known as Charlotte) refused.
He married first with Margherita Cesarini, and remarried on 23 February 1727 in Darmstadt with Landgravine Theodora of Hesse-Darmstadt (6 February 1706 – 23 January 1784), daughter of Philip of Hesse-Darmstadt, granddaughter of Louis VI, Landgrave of Hesse-Darmstadt.<br
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These marriages remained childless.
Antonio Ferrante was burned alive in an accident in Guastalla.<br>
After his death, the Duchy went to his younger brother Giuseppe Gonzaga.
Louis Gonzaga, Duke of Nevers
Louis Gonzaga, Duke of Nevers( or Luigi di Gonzaga- Nevers; 18 September 1539 – 23 October 1595) was an Italian- French dignitary and diplomat in France.
He was the third child of Frederick II Gonzaga, Duke of Mantua, and Margaret Palaeologina.
Cesare II Gonzaga, Duke of Guastalla
Cesare II Gonzaga( Mantua, 1592 – 26 February 1632) was Duke of Guastalla.
He was the son of Ferrante II Gonzaga, Duke of Guastalla and Duke of Amalfi and of Vittoria Doria.< br>
He succeeded his father in 1630, but died 2 years later.
He married in 1612 with Isabella Orsini( 1598 – 1623), and had 2 children:
Anna Isabella Gonzaga
Anna Isabella Gonzaga( 12 February 1655 – 11 August 1703), was a Duchess consort of Mantua and Montferrat and heir of the Duchy of Guastalla, including Luzzara and Reggiolo; married in 1671 to Ferdinando Carlo Gonzaga, Duke of Mantua and Montferrat.
She was the regent of Mantua during the War of the Spanish Succession.
Ferrante Gonzaga
Ferrante I Gonzaga (also Ferdinando I Gonzaga; 28 January 1507 – 15 November 1557) was an Italian condottiero, a member of the House of Gonzaga and the founder of the branch of the Gonzaga of Guastalla.
Ferrante III Gonzaga, Duke of Guastalla
Ferrante III Gonzaga( 4 April 1618 – 11 January 1678), was a Duke of Guastalla.
He was the son of Cesare II Gonzaga, Duke of Guastalla and Duke of Amalfi and Isabella Orsini.
Eleonora Luisa Gonzaga
Eleonora Luisa Gonzaga( 13 November 1686 – 16 March 1741) was the Duchess of Rovere and Montefeltro as the wife of Francesco Maria de' Medici.
She was the eldest child of Vincenzo Gonzaga, Duke of Guastalla and Sabbioneta and his second wife, Maria Vittoria Gonzaga.
She did not bear any children.

Question: Who is the paternal grandfather of Antonio Ferrante Gonzaga, Duke Of Guastalla?