Lucy Worsley, voice-over: Christmas Day, 1069, Northern England. ♪ A warrior king makes his way through the ruins of York Cathedral. The king's name is William I of England, but you might know ...

Ever wondered how a 13-year-old aspiring rapper in LA called William came to be known as will.i.am? It's been quite the road to superstardom, hear all about it from the man himself ...