No.
Yes. His character rivaled Patrick Swayze's character @ West Point Military academy and appeared again during the Civil War.
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Childhood Sweetheart
No. He has never provided a voice for Family Guy. He did however appear on South Park (not voicing himself obviously) being eaten by a monster.
No, David Hyde Pierce didn't appear on Family Guy. He did appear on The Simpsons as Cecil Terwilliger. He also appeared on Osmosis Jones.
The Guy Pearce character, Thompson dies at the beginning. Ralph Fiennes' Character dies also.
The same guy as what? If you are referring to the other guy in the commercial, then it does appear to be the same guy.