Cesare I Gonzaga
Cesare I Gonzaga (1530 – 15 February 1575) was count of Guastalla from 1557 until his death.
He was a member of the House of Gonzaga, the first-born son of the imperial condottiero Ferrante Gonzaga and Isabella di Capua.
From the latter, he inherited also the title of Count of Amalfi.
He was also Duke of Ariano and Prince of Molfetta.
On 21 May 1558 he was appointed commander-in-chief of the troops in Lombardy by Philip II.
On 12 March 1560 he married Camilla Borromeo, sister of Charles Borromeo and niece of Giovanni Angelo de' Medici, who had recently been elected Pope with the name of Pius IV.
Cesare Gonzaga was also a member of the Academy of the Vatican Nights, which met in the Casina Pio IV in the Vatican.
He founded the Accademia degli Invaghiti in Mantua, in the palace he inherited from his father.
In 1567–68 he moved his court from Mantua to Guastalla, where he remained until his death, employing Francesco da Volterra as his architect and engineer.
His mistress was Diana di Cordona.
His son Ferrante succeeded him in Guastalla.
Charles II Gonzaga, Duke of Nevers
Charles II Gonzaga( 22 October 1609 – 30 August 1631) was the son of Charles I, Duke of Mantua and Catherine de Lorraine- Guise( also known as Catherine de Mayenne), he was the Duke of Nevers and Rethel, together with his father.
In 1621, he succeeded his uncle Henri de Lorraine- Guise as Duke of Mayenne .< br>
In 1627 he married his cousin Maria Gonzaga, Marquise of Montferrat and heiress to the Duchy of Mantua.
However, Cesare II Gonzaga, Duke of Guastalla and Emperor Ferdinand II rejected her claim to Mantua, leading to the War of Mantuan Succession( 1628 – 1631).
Charles was never the proper Duke of Mantua since he died at Cavriana six years before his father.
When the latter died in 1637, Charles's eight- year- old son, Charles II, became Duke of Mantua, his widow Maria acting as regent.
His daughter Eleonora became Holy Roman Empress.
Isabella Boschetti
Isabella Boschetti or Boschetto( c.1502 –?) was a Mantuan noblewoman and lover of Federico II Gonzaga, Duke of Mantua.
She was nicknamed' La bella Boschetta'( the beautiful Boschetta).
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.
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.
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.
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.
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:
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>
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.

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