In 918 King Charles and Rollo met on the border of the Vexin and Roumois. The Roumois was the name then for the province of which Rouen was the capital. In a charter the king confirmed to Rollo the city of Rouen. He also gave him all the territory west to the border of Brittany. By 924 Normandy was growing into a principality. It was at this time he acquired Bayeux and also Maine. Rollo appears in annals only here and there. He was fighting over the castle of Eu against King Raoul. He also came to the aid of King Charles the Simple against Herbert II of Vermandois. Rollo died about 928. He was succeeded by his son William Longsword.