 Soon after, his mother appealed to Charles V, Holy Roman Emperor, and Charles sent his forces to seize Massa while Giulio was away.In March 1546, Giulio married Peretta Doria (1526–1591), daughter of Tommaso and sister of Giannettino Doria.Giulio had been promised a large dowry, which he wanted to fund a return to power, but Andrea Doria refused, arguing that he'd already spent more than the dowry on Giulio's first attempt to seize the Duchy.