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