Hanoverian Sires (20 characters)?

  Today I rode my instructor's Hanoverian gelding and we were discussing his bloodlines. She said his sire was a very famous, amazing horse, only I can't remember his name!! I knew I'd heard it before but now I can't seem to think of it and it's driving me insane.

Can anyone offer any insight on this? I know I'd know the name when I saw/heard it. I'm pretty sure he's imported from Europe, and the horse I rode today (his son) is almost 17 hands, dark bay gelding, ten years old. One white foot and a stripe on his face.

I know it's a difficult question to answer, but can anyone help me out? Thanks!
Why dont you ask your instuctor?