Matteo was assassinated early on in their rule in 1355. Upon Matteo's death, Galeazzo obtained the western part of Lombardy, while Bernabò received the eastern one. In 1362 Galeazzo's own health worsened and he moved his court to Pavia, which he had reconquered two years earlier, and where he died in 1378. Though Galeazzo died of natural causes, the same cannot be said for his last remaining brother. Bernabò received a fate similar to Matteo's and was assassinated in 1385. Galeazzo's son, Gian Galeazzo succeeded his father and uncle's rule and went on to achieve fame greater than that of his sibling and father. Beginning his twenty-five year rule in 1378, Gian Galeazzo eventually became the first official duke of Milan in 1395.