List of heads of state of Florence

The first de facto Lord in the history of the Republic of Florence was Cosimo de' Medici. Thanks to his moderate policy, Cosimo managed to maintain power for over thirty years until his death, ruling the state silently through his trusted men and thus allowing the consolidation of his family, the Medici, in the government of Florence.
In 1532, to reinforce and formalize the Medici rule in Florence, Pope Clement VII, himself a Medici, created the title of Duke of the Florentine Republic to Alessandro de' Medici. With the creation of the new title it abolished the age-old signoria and the office of gonfaloniere and replaced it with three institutions: the consigliere, the Senate and the Council of Two Hundred.

Background

From its creation in the 12th century until the first decades of the 15th century, the city-state of Florence was ruled by a series of democratic governments, such as the Consul, Podestà and most notably by a council known as the Signoria of Florence. The signoria was chosen by the gonfaloniere, who was elected every two months by Florentine guild members. Not having until that moment fallen into the hands of powerful dynasties as happened in several other Italian states. This situation completely changed with the rise of the Medici family, in that period owners of the largest European bank, and the wealthiest family of that era, which made the dynasty accumulate immense influence in the city, even without holding public offices.

Medici lords of Florence, 1512–1532

Portrait	Name	Lifespan	Reign	Consorts	Succession
	Cardinal Giovanni de' Medici	11 December 1475 – 1 December 1521	31 August 1512 – 9 March 1513	Never married	Son of Lorenzo, later became Pope Leo X
	Giuliano II de' Medici	12 March 1479 – 17 March 1516	9 March 1513 – 17 March 1516	Filiberta of Savoy 22 February 1515 Paris no issue 1 illegitimate son	Son of Lorenzo
	Lorenzo de' Medici	12 September 1492 – 4 May 1519	17 March 1516 – 4 May 1519	Madeleine de La Tour d'Auvergne 5 May 1518 Château d'Amboise, Amboise 1 daughter 1 illegitimate son	Son of Piero the Unfortunate
	Cardinal Giulio de' Medici	26 May 1478 – 25 September 1534	4 May 1519 – 19 November 1523	Never married	Son of Giuliano de Medici, later became Pope Clement VII
	Ippolito de' Medici	1511 – 10 August 1535	19 November 1523 – 16 May 1527	Never married	Illegitimate son of Giuliano II de Medici
	Alessandro de' Medici	22 July 1510 – 6 January 1537	16 May 1527 – 1530	Margaret of Parma 13 June 1536 Florence no issue 3 illegitimate children	Illegitimate son of Lorenzo II de Medici

After the Sack of Rome, Florence overthrew the Medicis once more and became a republic until Pope Clement VII signed a peace treaty with Charles V, Holy Roman Emperor who then invaded Florence and restored the Medicis.

Portrait	Name	Lifespan	Reign	Consorts	Succession
	Alessandro de' Medici	22 July 1510 – 6 January 1537	5 July 1531 – 1 May 1532	Margaret of Parma 13 June 1536 Florence no issue 3 illegitimate children	Illegitimate son of Lorenzo II de Medici

Medici dukes of Florence, 1532–1569

Portrait	Name	Lifespan	Reign	Consorts	Succession
	Alessandro de' Medici	22 July 1510 – 6 January 1537	1 May 1532 – 6 January 1537	Margaret of Parma 13 June 1536 Florence no issue 3 illegitimate children	Illegitimate son of Lorenzo II de Medici
	Cosimo I de' Medici	12 June 1519 – 21 April 1574	6 January 1537 – 21 August 1569	Eleanor of Toledo 29 June 1539 Florence 11 children Camilla Martelli 1570 1 daughter	Son of Giovanni dalle Bande Nere, later became the first Grand Duke of Tuscany.