When did the romans all invade the places like monarch castle in England and when did the Vikings live?

Viking expansion is the process by which Norse explorers, traders and warriors, the latter known in modern scholarship as Vikings, sailed most of the North Atlantic, reaching south to North Africa and east to Russia, Constantinople and the Middle East as looters, traders, colonists and mercenaries. Vikings under Leif Erikson, the heir to Erik the Red, reached North America and set up a short-lived settlement in present-day L'Anse aux Meadows, Newfoundland, Canada. Longer lasting and more established settlements were formed in Greenland, Iceland, the Faroe Islands, Great Britain, Ireland and Normandy.