Compléter Fill in the Blanks the Formation fo EnglandVersion en ligne Fill in the blanks with the correct information par Uriel 1 689 793 Viking Roman In , a army landed at the Lindisfarne Monastery and raided the sacred building . 2 Wessex Northumbria Mercia Sussex As the Vikings seized next in 875 , was the only remaining major kingdom under Anglo - Saxon authority . 3 Mercia Northumbria Viking Saxon Æthelstan ? s sister would marry the local ruler , Sihtric , who still controlled . 4 Æthelstan 917 Alfred Edward Æthelflæd In , expanded her lands to the north and was able to incorporate all of East Anglia into his kingdom . 5 Sussex Æthelflæd Æthelstan York marched on and was finally able to bring the Kingdom of under his crown as his sister ? s husband passed away .