Question: The father of Pietro de' Medici was the Duke of Florence between what years?

full_context: Document 1: Buonaccorso Pitti: Buonaccorso Pitti was a prominent Florentine merchant in the late 14th and early 15th centuries. His family was very prestigious and his father very involved in politics. He was a gambler and often made unsafe investments, though he managed to make money from it several times during his life. He bought and sold horses, wine, wool, and clothing among other things. In 1422, he was elected the Standard Bearer of Justice, Florence's highest post. In 1401, while serving as the Florentine ambassador to Bavaria, he, his brothers, and their descendants were ennobled by Rupert, King of Germany, after having saved his life by thwarting a poisoning attempt by the Duke of Milan. His son, Luca, built the Palazzo Pitti in Florence, but never finished it, it was given to him, but he sold it in 1549. Buonaccorso's descendants, the Counts Buonacorsi di Pistoia, moved from Tuscany to Bavaria in the late 19th century. The family emigrated to the U.S. in the early 20th century.
Document 2: Averardo de' Medici: Averardo de' Medici (1320-1363), also known as Everard De Medici, was the son of Salvestro de' Medici (died 1346), "il Chiarissimo" (English meaning "the very clear.") and the father of three children: Giovanni, Francesco, and Antonia. Giovanni di Bicci de' Medici would later become the first historically relevant member of Medici family of Florence and the eventual founder of the Medici bank.
Document 3: Apostolic Nunciature to Florence: The Apostolic Nunciature to Florence was an ecclesiastical office of the Catholic Church to the Republic of Florence, Italy and later the Grand Duchy of Tuscany. It was a diplomatic post of the Holy See, whose representative is called the Apostolic Nuncio with the rank of an ambassador. In 1533, the Republic of Florence was replaced by the Grand Duchy of Tuscany. The office ceased to exist in 1860 after the United Provinces of Central Italy, a client state of the Kingdom of Sardinia-Piedmont, annexed Tuscany in 1859 and then Tuscany was formally annexed to Sardinia in 1860, following a landslide referendum, in which 95% of voters approved.
Document 4: Lorenzo de' Medici, Duke of Urbino: Lorenzo di Piero de' Medici (] ), (12 September 1492 – 4 May 1519) was the ruler of Florence from 1516 to his death in 1519. He was also Duke of Urbino from 1516 to 1519. His daughter, Catherine de' Medici, became Queen Consort of France, while his illegitimate son, Alessandro de' Medici, became the first Duke of Florence.
Document 5: Medici: Masters of Florence: Medici: Masters of Florence is an Italian-British television drama series about the Medici dynasty set in 15th-century Florence, starring Dustin Hoffman as Giovanni di Bicci de' Medici, Richard Madden as Cosimo de' Medici, and Stuart Martin as Lorenzo de' Medici ("The Elder"). The series was co-created by Frank Spotnitz ("The X-Files" and "Man in the High Castle") and Nicholas Meyer (""). Sergio Mimica-Gezzan ("The Pillars of the Earth") directed all eight episodes. Episodes 1 and 2 aired on Rai 1 (Italian TV) on 18 October 2016. According to Italian ratings compiler Auditel, it attracted a record 7.6 million viewers. The first season consists of eight episodes.
Document 6: Pietro de' Medici: Don Pietro de' Medici (3 June 1554 – 25 April 1604) was the youngest son of Cosimo I de' Medici, Grand Duke of Tuscany and Eleonora di Toledo.
Document 7: Duchy of Florence: The Duchy of Florence (Italian: "Ducato di Firenze" ) was an Italian principality that was centred on the city of Florence, in Tuscany, Italy. The duchy was founded after Emperor Charles V restored Medici rule to Florence in 1530. Pope Clement VII, himself a Medici, appointed his relative Alessandro de' Medici as Duke of the Florentine Republic, thereby transforming the Republic of Florence into a hereditary monarchy.
Document 8: Anna de' Medici: Anna de' Medici (31 December 1569 – 19 February 1584) was the third child of Francesco I de' Medici, Grand Duke of Tuscany, and Joanna of Austria. She was a member of the famous House of Medici.
Document 9: Medici: Masters of Florence: Medici: Masters of Florence is an Italian-British television drama series about the Medici dynasty set in 15th-century Florence, starring Dustin Hoffman as Giovanni di Bicci de' Medici, Richard Madden as Cosimo de' Medici, and Stuart Martin as Lorenzo de' Medici ("The Elder"). The series was co-created by Frank Spotnitz ("The X-Files" and "Man in the High Castle") and Nicholas Meyer (""). Sergio Mimica-Gezzan ("The Pillars of the Earth") directed all eight episodes. Episodes 1 and 2 aired on Rai 1 (Italian TV) on 18 October 2016. According to Italian ratings compiler Auditel, it attracted a record 7.6 million viewers. The first season consists of eight episodes.
Document 10: Giovanni di Bicci de' Medici: Giovanni di Bicci de' Medici (c. 1360 – February 20/28, 1429) was an Italian banker, a member of Medici family of Florence, and the founder of the Medici Bank. While other family members, such as Chiarissimo di Giambuono de' Medici, who served in the Signoria in 1201, and Salvestro de' Medici, who was implicated in the Ciompi Revolt of 1378, are historically significant, Giovanni's founding of the family bank truly began the family's rise to power in Florence. He was the father of Cosimo de' Medici ("Pater Patriae"), grandfather of Piero di Cosimo de' Medici, great-grandfather of Lorenzo de' Medici (the Magnificent) and great-great-great-grandfather of Cosimo I de' Medici, Grand Duke of Tuscany.
Document 11: House of Visconti: Visconti is the family name of two important Italian noble dynasties of the Middle Ages. There are two distinct Visconti families: the first one (chronologically) in the Republic of Pisa in the mid twelfth century who achieved prominence first in Pisa, then in Sardinia, where they became rulers of Gallura. The second family rose to power in Milan, where they ruled from 1277 to 1447, and where several collateral branches still exist. Pope Gregory X, who reigned from 1271 to 1276, was a member of the Visconti family of Milan. The renowned film director Luchino Visconti was a scion of this latter family's Visconti of Modrone branch.
Document 12: Eleonora di Garzia di Toledo: Eleonora di Garzia di Toledo (March 1553 – 11 July 1576), more often known as "Leonora" or "Dianora", was the daughter of García Álvarez de Toledo, 4th Marquis of Villafranca, Duke of Fernandina, and the wife of Don Pietro de' Medici, a son of Cosimo I de' Medici, Grand Duke of Tuscany. Leonora was born in Florence, where she was brought up by Cosimo and Eleanor of Toledo, her aunt and namesake. Betrothed to their son Pietro at the age of 15, she blossomed under the wing of Pietro's older sister, the artistic patron Isabella, into a vivacious and witty beauty. Her marriage, like Isabella's, was not a success, and she followed her mentor's example of taking lovers. For this reason, Pietro had her brought in 1576 to the country retreat of Cafaggiolo, where he strangled her to death with a dog leash. Cosimo's successor, Francesco I, tacitly approved the murder, and Pietro was never brought to justice for it.
Document 13: 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.
Document 14: Jacopo Corsi: Jacopo Corsi (17 July 1561 – 29 December 1602) was an Italian composer of the late Renaissance and early Baroque and one of Florence's leading patrons of the arts, after only the Medicis. His best-known work is "Dafne" (1597/98), whose score he wrote in collaboration with Jacopo Peri. Six fragments of the score have survived, two by Corsi and four by Peri. The libretto, by Ottavio Rinuccini, has survived intact. Despite priority quibbles at the time, Dafne is generally accepted as the first opera.
Document 15: Taddea Malaspina: Taddea Malaspina (1505 - ?) was an Italian marchesa. She was the mistress of Alessandro de' Medici, Duke of Florence from the early 1530s to about 1537 and was likely the mother of at least two of his children, Giulio di Alessandro de' Medici and Giulia de' Medici. Giulio de' Medici was associated with the Malaspina family at different points throughout his life. Taddea was the younger daughter of Alberico Malaspina, sovereign marquis of Massa, and Lucrezia d'Este. She married Count Giambattista Boiardo di Scandiano. After his death and the death of her father, Malaspina lived with her mother in Florence and had a number of lovers, including Alessandro. Her sister Ricciarda inherited the title after their father's death. Through Ricciarda's marriage, the family was related to Pope Innocent VIII. Ricciarda was probably also one of Alessandro de' Medici's lovers.
ground_truth: 1537 until 1569