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 :
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>
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>
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.
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.
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.
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.
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.
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>
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.
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.
Vicente de Gonzaga y Doria
Vicente de Gonzaga y Doria,( 1602 – 23 November 1694) was Viceroy of Valencia, 1663, Viceroy of Catalonia, 1664 – 1667 and Viceroy of Sicily, 1678, second of the 11 sons/ daughters of Ferrante II Gonzaga, 1st Duke of Guastalla,( 1563 – 5 August 1630), married in 1587 to Donna Vittoria Doria dei Principi di Melfi,( 1569 – 1618), daughter of Genoese Admiral of the Spanish Fleet and Member of the Spanish Royal Council, Giovanni Andrea Doria, Prince of Melfi.
Vicente's eldest brother was Cesare II Gonzaga, Duke of Guastalla.
Another sister, Zenobia de Gonzaga y Doria,(* 1588 –+ 1618) married in 1607 don Giovanni Tagliavia d' Aragona, Duke of Terranova, a title awarded to Gonzalo Fernández de Córdoba in the year 1502, from a powerful Aragonese- Sicilian family, linked to the Princes of Castelvetrano, a Sicilian town, located at 37°41′0 ″ N 12°47′35″E.
Francesco III Gonzaga, Duke of Mantua
Francesco III Gonzaga (10 March 1533 – 22 February 1550) was Duke of Mantua and Marquess of Montferrat from 1540 until his death.
He was the eldest son of Federico II Gonzaga, Duke of Mantua and his wife Margaret Paleologina.

Question: Who is Ferrante Iii Gonzaga, Duke Of Guastalla's paternal grandfather?