Cosimo I de' Medici, Grand Duke of Tuscany
Cosimo I de' Medici( 12 June 1519 – 21 April 1574) was the second Duke of Florence from 1537 until 1569, when he became the first Grand Duke of Tuscany, a title he held until his death.
Don Giovanni de' Medici
Don Giovanni de' Medici( 13 May 1567, in Florence – 19 July 1621, in Murano) was an Italian military commander, diplomat and architect.
Medici was born the illegitimate son of Cosimo I de' Medici, Grand Duke of Tuscany and of Eleonora of Albizzi.
Medici was later legitimated by his father.
He was born 5 years after the death of his brother, Giovanni, and was given the same name.
He moved to Spain where he began his military career.
In 1598 he was a Grandee of Spain and Florentine ambassador in Madrid.
In 1600 he was Master of the Field for the Imperial army, but his most important appointment was as Commander- in- Chief of the army of the Republic of Venice( 1616 – 1617).
He married Livia del Vernazza, with whom he had two sons; Gianfrancesco Maria( 1619 – 1689) and another that was born posthumously but died as an infant.
Giovanni was also a painter and an architect, and collaborated with Matteo Nigetti in the design of the Principi Chapel for the church of San Lorenzo in Florence.
On his return home he caught the smallpox at Padova.
He died at Murano in 1621.
Giovanni di Bicci de' Medici
Giovanni di Bicci de' Medici( c. 1360 – February 1429) was an Italian banker and founder of the Medici Bank.
While other members of the Medici family, such as Chiarissimo di Giambuono de' Medici, who served in the Signoria of Florence in 1201, and Salvestro de' Medici, who was implicated in the Ciompi Revolt of 1378, are of historical interest, it was Giovanni's founding of the family bank that truly initiated the family's rise to power in Florence.
He was the father of Cosimo de' Medici and Lorenzo de' Medici, and an ancestor of other notable Medici rulers.
For example, he was the grandfather of Piero di Cosimo de' Medici; the great- grandfather of Lorenzo de' Medici( the Magnificent); and the great- great- great- grandfather of Cosimo I de' Medici, Grand Duke of Tuscany.
Nannina de' Medici
Nannina de' Medici( 14 February 1448 – 14 May 1493), born Lucrezia de' Medici, was the second daughter of Piero di Cosimo de' Medici and Lucrezia Tornabuoni.
She was thus the elder sister of Lorenzo de' Medici.
She married Bernardo Rucellai.
Her father's name was Piero, so she is sometimes known as Lucrezia di Piero de' Medici.
Eleonora degli Albizzi
Eleonora degli Albizzi
( Florence, 1543- Florence, 19 March 1634) was a mistress of Cosimo I de' Medici, the Granduke of Tuscany.
She bore him an illegitimate son, Don Giovanni de' Medici.
Giovanni il Popolano
Giovanni de' Medici, in full Giovanni di Pierfrancesco de' Medici, later known as il Popolano( the commoner)( 21 October 1467 – 14 September 1498) was an Italian nobleman of the Medici House of Florence.
He was the son of Pierfrancesco di Lorenzo de' Medici, and therefore a member of a secondary branch of the family.
Giovanni de Gennaro (bishop)
Giovanni de Gennaro or Giovanni de Guevara( died 1556) was a Roman Catholic prelate who served as Bishop of Sant' Agata de' Goti( 1523 – 1556).
Luisa de' Medici
Luisa de' Medici( 25 December 1476- 1488) was an Italian noble.
She was the daughter of Lorenzo de' Medici and Clarice Orsini.
She was going to marry with her fiancé Giovanni di Pierfrancesco de' Medici, but she died in 1488 at aged 11.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Giovanni de' Medici (cardinal)
Giovanni di Cosimo I de' Medici( 29 September 1544 – 20 November 1562), also known as Giovanni de' Medici the Younger, was an Italian cardinal.

Question: What is the date of death of Don Giovanni De' Medici's father?
Answer: 21 April 1574