Reply #7: President Anwar Al Sadat did so in 1977

[Xipe Totec]

On November 19, 1977, Sadat became the first Arab leader to officially visit Israel when he met with Israeli prime minister Menachem Begin, and spoke before the Knesset in Jerusalem about his views on how to achieve a comprehensive peace to the Arab-Israeli conflict, which included the full implementation of UN Resolutions 242 and 338. He made the visit after receiving an invitation from Begin and once again sought a permanent peace settlement (much of the Arab World was outraged by the visit, due to their widespread view of Israel as a rogue state, and a tyrannical symbol of imperialism). This visit went against the U.S. and Soviet Union’s intentions, which were to revive the international Geneva Conference. In 1978, this resulted in the Camp David Peace Agreement, for which Sadat and Begin received the Nobel Peace Prize.

http://en.wikipedia.org/wiki/Anwar_Sadat