Cosimo I de' Medici (12 June 1519 – 21 April 1574) was the second and last duke of Florence from 1537 until 1569, when he became the first grand duke of Tuscany, a title he held until his death. Cosimo I succeeded his cousin to the duchy. He built the Uffizi (office) to organize his administration, and conquered Siena to consolidate Florence's rule in Tuscany. He expanded the Pitti Palace and most of the Boboli Gardens were also laid out during his reign.
The House of Medici (English: /ˈmɛdɪtʃi/MED-itch-ee, UK also /məˈdiːtʃi/mə-DEE-chee; Italian:[ˈmɛːditʃi]) was an Italian banking family and political dynasty that first consolidated power in the Republic of Florence under Cosimo de' Medici and his grandson Lorenzo "the Magnificent" during the first half of the 15th century. The family originated in the Mugello region of Tuscany, and prospered gradually in trade until it was able to fund the Medici Bank. This bank was the largest in Europe in the 15th century and facilitated the Medicis' rise to political power in Florence, although they officially remained citizens rather than monarchs until the 16th century.
In 1532, the family acquired the hereditary title Duke of Florence. In 1569, the duchy was elevated to the Grand Duchy of Tuscany after territorial expansion. The Medici ruled the Grand Duchy from its inception under the builder Cosimo I until 1737, with the death of Gian Gastone de' Medici. The Medici produced four popes of the Catholic Church—Pope Leo X (1513–1521), Pope Clement VII (1523–1534), Pope Pius IV (1559–1565) and Pope Leo XI (1605)—and two queens of France—Catherine de' Medici (1547–1559) and Marie de' Medici (1600–1610). The Medici's grand duchy witnessed degrees of economic growth under the early grand dukes, but was bankrupt by the time of Cosimo III de' Medici (r. 1670–1723).
Cosimo I de' Medici in the context of Fountain of Neptune, Florence
The Fountain of Neptune (Italian: Fontana del Nettuno) in Florence, Italy, is situated in the Piazza della Signoria, in front of the Palazzo Vecchio. The fountain was commissioned by Cosimo I de' Medici in 1559 to celebrate the marriage of Francesco de' Medici I to Grand Duchess Joanna of Austria. Cosimo I de' Medici was the Duke of Florence from 1537-1569 and responsible for a vast number of architectural and artistic elements in Florence that still exist today.
The fountain was designed by Baccio Bandinelli, but created by Bartolomeo Ammannati with the assistance of several other artists between 1560 and 1574. It incorporates a series of mythological figures and iconographies that symbolize both Cosimo I de' Medici's power and the union of Francesco and Joanna.