Robert the Strong
In 861, Charles the Bald, king of West Francia, created the March of Neustria, combining the Norman March and the Breton March. They were invested to Adalard the Seneschal and Robert the Strong, respectively. Gauzfrid and his brother Rorgon II, who was Count of Maine at the time, revolted against Robert. The two brothers allied with Salomon of Brittany in opposition to Robert the Strong.