Roger I of Tosny Fécamp Abbey were installed. This monastery was one of the first baronial foundations in Normandy The foundation charter reveals that the lord of Tosny gave it a small possession around Conches and his forest. In 1035, Robert I's death began a troubled period in the duchy of Normandy. Civil wars multiplied and Roger (whose relations with his neighbours was already argumentative) was one of the main players in them. According to the Norman chroniclers, the lord of Tosny refused to serve the new duke, the future William the Conqueror, due to his being a bastard. He especially took advantage of
William Augustus, Duke of Brunswick-Harburg France and England and then enrolled with his brothers at the University of Helmstedt. In 1594, he again went on a journey that took him through Germany, Poland, Switzerland, Italy, Holland, Denmark and Livonia. William Augustus kept a journal about his travels. After the death of his father, he took up the government of Harburg jointly with his brothers Christopher and Otto III. After they died, he ruled alone. In 1618, William Augustus began the construction of the palace at Moisburg. After the death of the Duke Frederick Ulrich of Brunswick-Wolfenbüttel, he received the County of Hoya from his inheritance.