Question

List all the proper nouns

The last group of raiders to terrorize western Europe were the Vikings, fierce Scandinavian warriors who almost overran England before King Alfred negotiated peace with King Guthrum of the Danes.

Answer 1

Europe, Vikings, Scandinavian, England, King Alfred, King Guthrum of the Danes. Hint: if the noun is a specific person, place, or thing and it's capitalized then it's likely it's a proper noun.