Fill in the Blanks Fill in the Blanks the Formation fo EnglandOnline version Fill in the blanks with the correct information by Uriel 1 Roman 689 793 Viking 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 Viking Mercia Northumbria Saxon Æthelstan ? s sister would marry the local ruler , Sihtric , who still controlled . 4 Æthelstan Alfred Edward Æthelflæd 917 In , expanded her lands to the north and was able to incorporate all of East Anglia into his kingdom . 5 York Æthelflæd Æthelstan Sussex marched on and was finally able to bring the Kingdom of under his crown as his sister ? s husband passed away .