Who is Claus von Stauffenberg from Bonhoeffer: Pastor, Martyr, Prophet, Spy and what is their importance?

This German army officer was one of the planners of the failed Valkyrie plot to kill Adolf Hitler. In fact, he was the one who literally carried the bomb in a briefcase into the meeting with the Fuhrer at which it was supposed to be detonated. Stauffenberg left the meeting before the bomb exploded relatively harmlessly. He was later discovered to be the person who planted the bomb, tried and executed within days of the assassination attempt.