By the time Arnulf attained his majority in 976 , Flanders had lost some of the southern territory acquired by Arnulf I . The latter had given some parts of Picardy to King Lothar of France to help assure his grandson 's succession , and gave Boulogne as a fief to another relative .
By the time Arnulf reached his age of majority in 976 , Flanders had lost some of the southern territory acquired by Arnulf I. His grandfather had given some parts of Picardy to King Lothar of France to help make sure his grandson , Arnulf II would succeed him .