Thousands of Egyptians gathered at Cairo's Tahrir Square on Wednesday to celebrate the first anniversary of the country's revolution. On January 25, 2011, tens of thousands of Egyptians gathered in the capital to demand the resignation of then president-Hosni Mubarak. After 18 days of massive protests, Mubarak was forced to relinquish the presidency and hand over power to a military council.
One year after Tahrir, HuffPost World looks back at 6 key figures of Egypt's revolution. Read more about opposition leader Ayman Nour, Nobel Prize winner Mohamed ElBaradei or former Google executive Wael Ghonim in the slideshow below.