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