Cosimo de' Medici (Pater Patriae) : from : 1434 | Cosimo de' Medici (Pater Patriae) : relationship_with_predecessor : Son of Giovanni di Bicci de' Medici who was not as prominently involved in Florentine politics, rather more involved in the financial area.
Cosimo de'Medici, Pater Patriae and son of Giovanni di Bicci de' Medici, became the de facto ruler of Florence in 1434.