Origins
The Medici emerged from the medieval Florentine bourgeoisie. The earliest documented Medici ancestors were small-scale wool merchants and money-changers of the late 13th and 14th centuries. The family had occasional political prominence — Salvestro de’ Medici was an important figure in the radical Ciompi wool-workers’ revolt of 1378 — but no sustained political position.
The dynastic ascent began with Giovanni di Bicci de’ Medici (1360–1429), who founded the Banco Medici in 1397. The bank specialized in international currency exchange, deposit banking, and (most lucratively) papal banking — the management of the international cash flows of the Catholic Church. By Giovanni’s death in 1429, the Banco Medici was one of the four or five largest banks in Europe, with branches in Rome, Venice, Geneva, Bruges, London, and (later) Lyon.
Cosimo and Lorenzo
Giovanni’s son Cosimo de’ Medici (1389–1464) — known posthumously as Cosimo il Vecchio (Cosimo the Elder) or Pater Patriae (Father of the Country) — became the dominant Florentine political figure of his generation. Cosimo was technically a private citizen with no official position beyond occasional service on Florentine councils; in practice he ran Florence through his control of the bank’s political clientele and his command of the city’s financial and electoral mechanisms. His exile in 1433 and return in 1434 marked the moment at which Medici political dominance became institutionalized; he ruled Florence in this informal mode for the next thirty years.
The cultural patronage that defined the Medici reputation began with Cosimo. He commissioned the Dominican monastery of San Marco (with Fra Angelico’s frescoes), the Palazzo Medici (the family’s town palace, the prototype for the Renaissance palazzo), and supported Brunelleschi’s completion of the dome of Florence cathedral. He purchased the Greek manuscripts that founded the Platonic Academy at Careggi, which restored Plato to Western intellectual life under Marsilio Ficino.
Lorenzo de’ Medici (1449–1492) — Lorenzo il Magnifico (Lorenzo the Magnificent) — was Cosimo’s grandson and the most famous Medici. He inherited the political position at age 20 in 1469 and ruled Florence until his death. The Florentine cultural-political moment most associated with the high Renaissance was Lorenzo’s reign. He patronized Botticelli (the Primavera and the Birth of Venus were painted for Medici patrons), commissioned early work from Michelangelo (who lived in the Medici household as a teenager), and corresponded with the leading humanist scholars of Europe.
The Pazzi Conspiracy (26 April 1478) — an assassination attempt by the rival Pazzi banking family, with papal involvement — killed Lorenzo’s brother Giuliano at High Mass in Florence cathedral. Lorenzo escaped wounded, executed the conspirators, and emerged politically strengthened.
The exile and return
Lorenzo’s son Piero the Unfortunate (1472–1503) presided over the collapse of Medici Florentine rule. The French invasion of Italy in 1494 produced a political crisis that the Medici could not survive; Piero was expelled in November 1494 and the city returned to a republican constitution under the Dominican friar Girolamo Savonarola (whose theocratic regime lasted four years before his own execution).
The Medici returned to power in 1512 with Spanish military support. The first Medici pope — Lorenzo’s son Giovanni de’ Medici, who took the name Leo X — was elected in March 1513. Leo X presided over the early years of the Lutheran Reformation; the indulgence sales that triggered Luther’s 1517 protest were financing Leo’s reconstruction of St Peter’s Basilica. Leo’s cousin Giulio de’ Medici became Clement VII in 1523 and presided over the Sack of Rome of 1527 — the worst single disaster of the early modern papacy.
The Grand Duchy
The political form of Medici rule shifted from informal banking-family dominance to formal hereditary monarchy in the mid-16th century. Cosimo I de’ Medici (1519–1574), a distant cousin from a junior Medici line, was made Duke of Florence in 1537 and Grand Duke of Tuscany in 1569. The Grand Duchy of Tuscany was a recognized European principality that survived until 1737.
The Grand Ducal period produced two queens of France: Catherine de’ Medici (Lorenzo the Magnificent’s great-granddaughter) was queen consort to Henry II (married 1533) and regent during the long minorities and short reigns of her three sons; her great-niece Marie de’ Medici was queen consort to Henry IV and regent for the young Louis XIII. Catherine’s reputation was substantially damaged by the Saint Bartholomew’s Day Massacre of August 1572 (between 5,000 and 30,000 Huguenots killed in coordinated Catholic violence), which she had (along with her son Charles IX) authorized.
The dynasty produced its last grand duke in Gian Gastone de’ Medici (1671–1737), an unmarried alcoholic homosexual who left no heir. The Habsburg-Lorraine dynasty inherited Tuscany on his death. The Banco Medici itself had failed in 1494, two centuries earlier.
Legacy
The Medici cultural patronage — three centuries’ worth of palace architecture, public sculpture, painting commissions, manuscript collection, and intellectual sponsorship — produced the visible material core of the Italian Renaissance. Modern Florence preserves the Medici inheritance more conspicuously than that of any other early-modern European family: the Uffizi (originally the Medici offices), the Pitti Palace, the Palazzo Medici-Riccardi, the Boboli Gardens, San Lorenzo with the Medici Chapels and Michelangelo’s New Sacristy, and the dozens of Medici-commissioned major artworks now distributed across Italian and European museums.
The Medici financial-political model — the bank that financed kings and used kings’ political dependence to advance the family’s interests — has been a recurring template in subsequent European banking history (the Fuggers of 16th-century Augsburg, the Rothschilds of 19th-century Frankfurt, several modern parallels).