During the reign of the three brothers, they wanted to increase their privileges and governing powers, so they decided to re-establish good relations with Holy Roman Empire so they could acquire the status of imperial vicars. On May 8, 1355, a diploma of a new vicariate for the three brothers was forged after Emperor Charles IV accepted a payment of 150000 florins from them. According to Jane Black, the imperial vicariate granted more privileges to the three brothers compared to the privileges that their predecessors had received. Most of the privileges the three brothers received from the vicariate were related to judicial processes such as the right to raise imperial taxes. The diploma also granted the Visconti brothers full control over communal laws and customs in their territory. The title of imperial vicar was also hereditary, meaning that the future lords of Milan would be granted the same rights that were granted to the Visconti brothers by Charles IV. Although Galeazzo II and Bernabò continued referred to themselves as dominus generalis in their official documents, the two brothers eventually referred to themselves as imperial vicars as well to demonstrate their abundance of power to their subjects.