The flame, meant to represent purity, was kindled from the rays of the sun using a parabolic mirror in a ceremony on 10 May at Olympia, the home of the ancientOlympicGames.
When the AncientGames were revived as the Modern OlympicGames in Athens 1896, local hero Spiridon Louis won the marathon -- as he should have -- to bring his country international recognition and fame.
Mr Rogge said that like the messengers in ancient times who shared news of the Olympic truce - the laying down of arms for the Games - "the torchbearers who carry this flame to London will spread the message of sport's capacity to promote peace and to make our world a better place".