A fort that is more than 1,000 years old, dating back to the time of Alfred the Great, has been unearthed in Scotland, more than 200 years after it was thought to have been completely destroyed. The ancient fort was built by the Picts, a loose confederation of tribes who lived in what is now Scotland during the Dark Ages. The fort was likely a major source of power for the Pictish kingdom between A.D. 500 and 1000.