The land that now comprises most of the Scottish Lowlands had previously been the northernmost part of the Anglo-Saxon kingdom of Northumbria, which fell apart with its Viking conquest; these lands were never regained by the Anglo-Saxons, or England. The upheaval and pressure of Viking raiding, occupation, conquest and settlement resulted in alliances among the formerly enemy peoples that comprised what would become present-day Scotland. Over the subsequent 300 years, this Viking upheaval and pressure led to the unification of the previously contending Gaelic, Pictish, British, and English kingdoms, first into the Kingdom of Alba, and finally into the greater Kingdom of Scotland. The Viking Age in Scotland came to an end after another 100 years. The last vestiges of Norse power in the Scottish seas and islands were completely relinquished after another 200 years.