Following Greece's independence, archaeological excavation as early as 1836 uncovered traces of the stadium of Herodes Atticus. Further, more thorough, excavation was conducted by the German-born architect Ernst Ziller in 1869–70. Some marbles of the stadium and four Hermai were found. The Zappas Olympics, an early attempt to revive the ancient Olympic Games, were held at the stadium in 1870 and 1875. They were sponsored by the Greek benefactor Evangelis Zappas. The games had an audience of 30,000 people.