Egypt's Mubarak resigns as leader
into the leadership of the Arab world's most populous country, and has been forced out by a wave of popular protest.
Mubarak became Egypt's fourth president after the killing of Anwar Sadat
As Commander of the Egyptian Air Force and Deputy Minister of Defence, he was instrumental in planning the surprise attack on Israeli forces occupying Egypt's Sinai peninsula at the start of the 1973 Yom Kippur war.
To the West, Egypt was a key ally - a voice of moderation on the Israeli-Palestinian conflict.