[["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.