# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/cosimo-iii-de-medici-grand-duke-of-tuscany
# Generated: 2026-08-31T18:51:59.669Z

schema: https://schema.org/Person
url: "https://fame.am/person/cosimo-iii-de-medici-grand-duke-of-tuscany"
name: "Cosimo III de' Medici, Grand Duke of Tuscany"
slug: "cosimo-iii-de-medici-grand-duke-of-tuscany"
description: "He held Tuscany for fifty-three years — the longest reign in its history — and watched it collapse into economic ruin under his hand. Cosimo III spent his final decades trying to rewrite succession law so his daughter could inherit, a campaign that died with him."
tagline: "Grand Prince of Tuscany (1642-1723)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Volterrano%2C_Cosimo_III_de'_Medici_in_grand_ducal_robes_(Warsaw_Royal_Castle).jpg"
gender: "male"
category:
  name: "Politicians"
  slug: "politicians"
profileType:
  name: "Politician"
  slug: "politician"
birthDate: "1642-08-14"
deathDate: "1723-10-31"
livingStatus: "DECEASED"
scores:
  popularity:           54.47
  momentum:             0.5325649384226459
  historical:           23.450668
  currentAttention:     1.4339289653651
  sourceConfidence:     60
  profileCompleteness:  60
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
tags:
  - name: "Politicians"
    slug: "politicians"
  - name: "Founder"
    slug: "founder"
  - name: "Founders"
    slug: "founders"
  - name: "Politics"
    slug: "politics"
  - name: "Early Modern Era"
    slug: "early-modern-era"
sources:
  - url: "https://www.wikidata.org/wiki/Q47292"
    title: "Wikidata"
    type:  "WIKIDATA"
  - url: "https://en.wikipedia.org/wiki/Cosimo_III_de'_Medici,_Grand_Duke_of_Tuscany"
    title: "Wikipedia"
    type:  "WIKIPEDIA"
  - url: "https://pantheon.world/profile/person/Cosimo%20III%20de'%20Medici%2C%20Grand%20Duke%20of%20Tuscany"
    title: "Pantheon 2.0"
    type:  "DATABASE"
  - url: "https://az.wikipedia.org/wiki/III_Kozimo_(Toskana_hersoqu)"
    title: "III Kozimo (Toskana hersoqu)"
    type:  "WIKIPEDIA"
  - url: "https://bg.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B7%D0%B8%D0%BC%D0%BE_III_%D0%B4%D0%B5_%D0%9C%D0%B5%D0%B4%D0%B8%D1%87%D0%B8"
    title: "Козимо III де Медичи"
    type:  "WIKIPEDIA"
  - url: "https://br.wikipedia.org/wiki/Cosimo_III_de'_Medici"
    title: "Cosimo III de' Medici"
    type:  "WIKIPEDIA"
  - url: "https://ca.wikipedia.org/wiki/Cosme_III_de_M%C3%A8dici"
    title: "Cosme III de Mèdici"
    type:  "WIKIPEDIA"
  - url: "https://cs.wikipedia.org/wiki/Cosimo_III._Medicejsk%C3%BD"
    title: "Cosimo III. Medicejský"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Cosimo_III._de%E2%80%99_Medici"
    title: "Cosimo III. de’ Medici"
    type:  "WIKIPEDIA"
  - url: "https://el.wikipedia.org/wiki/%CE%9A%CF%8C%CE%B6%CE%B9%CE%BC%CE%BF_%CE%93%CE%84_%CF%84%CF%89%CE%BD_%CE%9C%CE%B5%CE%B4%CE%AF%CE%BA%CF%89%CE%BD"
    title: "Κόζιμο Γ΄ των Μεδίκων"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Cosimo_III_de'_Medici"
    title: "Cosimo III de' Medici"
    type:  "WIKIPEDIA"
  - url: "https://es.wikipedia.org/wiki/Cosme_III_de_M%C3%A9dici"
    title: "Cosme III de Médici"
    type:  "WIKIPEDIA"
  - url: "https://et.wikipedia.org/wiki/Cosimo_III"
    title: "Cosimo III"
    type:  "WIKIPEDIA"
  - url: "https://fi.wikipedia.org/wiki/Cosimo_III"
    title: "Cosimo III"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Cosme_III_de_M%C3%A9dicis"
    title: "Cosme III de Médicis"
    type:  "WIKIPEDIA"
  - url: "https://hu.wikipedia.org/wiki/III._Cosimo_de%E2%80%99_Medici"
    title: "III. Cosimo de’ Medici"
    type:  "WIKIPEDIA"
  - url: "https://id.wikipedia.org/wiki/Cosimo_III_de'_Medici"
    title: "Cosimo III de' Medici"
    type:  "WIKIPEDIA"
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    title: "Cosimo III de' Medici"
    type:  "WIKIPEDIA"
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    title: "コジモ3世"
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    title: "კოზიმო III მედიჩი"
    type:  "WIKIPEDIA"
  - url: "https://ko.wikipedia.org/wiki/%EC%BD%94%EC%8B%9C%EB%AA%A8_3%EC%84%B8_%EB%8D%B0_%EB%A9%94%EB%94%94%EC%B9%98"
    title: "코시모 3세 데 메디치"
    type:  "WIKIPEDIA"
  - url: "https://la.wikipedia.org/wiki/Cosimus_III_Medices"
    title: "Cosimus III Medices"
    type:  "WIKIPEDIA"
  - url: "https://nl.wikipedia.org/wiki/Cosimo_III_de'_Medici"
    title: "Cosimo III de' Medici"
    type:  "WIKIPEDIA"
  - url: "https://pl.wikipedia.org/wiki/Kosma_III_Medyceusz"
    title: "Kosma III Medyceusz"
    type:  "WIKIPEDIA"
  - url: "https://pt.wikipedia.org/wiki/Cosme_III_de_M%C3%A9dici"
    title: "Cosme III de Médici"
    type:  "WIKIPEDIA"
  - url: "https://ro.wikipedia.org/wiki/Cosimo_al_III-lea_de'_Medici%2C_Mare_Duce_de_Toscana"
    title: "Cosimo al III-lea de' Medici, Mare Duce de Toscana"
    type:  "WIKIPEDIA"
  - url: "https://en.wikiquote.org/wiki/Cosimo_III_de'_Medici"
    title: "Wikiquote"
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    title: "Wikiquote"
    type:  "WEBSITE"
  - url: "https://ar.wikipedia.org/wiki/%D9%83%D9%88%D8%B2%D9%8A%D9%85%D9%88_%D8%A7%D9%84%D8%AB%D8%A7%D9%84%D8%AB"
    title: "كوزيمو الثالث"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D9%83%D9%88%D8%B2%D9%8A%D9%85%D9%88_%D8%A7%D9%84%D8%AA%D8%A7%D9%84%D8%AA"
    title: "كوزيمو التالت"
    type:  "WIKIPEDIA"

# bio (long form, separated for readability)
bio: |
  Cosimo III became Grand Duke in 1670, the elder son of Ferdinando II and sixth Medici to rule Tuscany. His marriage to Marguerite Louise d'Orléans, cousin of Louis XIV, was solemnized by proxy at the Louvre in 1661 and proved disastrous; she eventually abandoned Florence for a convent in Montmartre. They had three children: Ferdinando in 1663, Anna Maria Luisa in 1667, and Gian Gastone in 1671. His reign was marked by laws regulating prostitution and May celebrations, and by Tuscany's slide into previously unknown economic lows. When it became clear his sons would produce no heirs, he tried to make Anna Maria Luisa universal heiress, but Charles VI refused to alter the succession of an imperial fief. Cosimo died in 1723 and was succeeded by Gian Gastone; fourteen years later the Medici line ended and Tuscany passed to Lorraine.