The House of Medici rose in fifteenth-century Florence not from a throne but from a bank. Cosimo de' Medici, called Pater Patriae, turned the family's fortune into unofficial rule of the republic, and his grandson Lorenzo the Magnificent made the Medici the defining patrons of the Renaissance, funding the workshops that produced Botticelli, Michelangelo, and Leonardo. From merchant beginnings the family climbed, within a few generations, into the sovereign nobility of Europe as Grand Dukes of Tuscany.
The Medici genogram is really a study in how a private family purchased and married its way into the ruling class. The dynasty produced four popes — Leo X and Clement VII in the direct line, followed by Pius IV and Leo XI from related branches — and papal power was used to advance blood relatives, most famously when Clement VII negotiated the marriage of his young kinswoman Catherine de' Medici to the future Henry II of France in 1533.
That single marriage rerouted French history through Florentine banking stock. Catherine de' Medici became queen consort and then, as a formidable regent, mother to three kings of France — Francis II, Charles IX, and Henry III — steering the crown through the Wars of Religion. A century's remove later a second Medici bride, Marie de' Medici, married Henry IV of France and became the mother of Louis XIII, so the family that began by lending money ended up grandmothering the Bourbon dynasty of France.
The line that had bankrolled the Renaissance guttered out in 1743 with Anna Maria Luisa de' Medici, the last of the grand-ducal house. Childless, she willed the family's staggering art collection to the Tuscan state on the condition that nothing ever leave Florence — a single clause that kept the Uffizi's treasures in the city and, three centuries on, still underwrites its tourism.
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