Gabriele Maria Visconti dating history

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Gabriele Maria Visconti (1385–1408) was an illegitimate child of Gian Galeazzo Visconti, Duke of Milan, with Agnese Mantegazza. Upon his father's death in 1402, when he was sixteen years old, he inherited the signoria (lordship) of Pisa and its contado (hinterland). He also inherited the signoria of Crema and Sarzana. All these lordships were assigned to him in appanage as a vassal of his legitimate half-brother and new duke of Milan, Giovanni Maria Visconti, who was fourteen at the time and therefore under the regency of their mother Caterina Visconti.