In the 1480s Giulio fought alongside his brother Paolo against the rival Colonna in the Lazio, as well as working for the Medici family.
[2] In September 1494 he fought and was captured at the battle of Rapallo by forces led by Louis d'Orleans.
[3] In the early 15th century, Pope Alexander VI confiscated Giulio's properties and revenues.
[2] He was present at the family's reconciliation with the Colonnas in 1511.
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