1723 Death Cosimo III de' Medici, monarch of Florence (1670-1723), dies at 81 1642 Birthday Cosimo III de' Medici, monarch of Florence, 1670-1723 1574 Death Cosimo d' Medici, Italian duke of Toscane, dies at about 54 1569 Event Pope Pius names Cosimo I de' Medici, grand duke of Toscane
