Final answer:
Egyptian President Anwar Sadat was the leader involved in the Yom Kippur War of 1973, which was an attempt by Egypt and Syria to reclaim territories lost to Israel in 1967.
Step-by-step explanation:
The leader who was directly involved in the Yom Kippur War in 1973 was Anwar Sadat, the President of Egypt. He was instrumental in initiating the October 1973 invasion by Egypt and Syria of the Sinai Peninsula and Golan Heights, territories which had been under Israeli occupation since 1967. The military actions were an attempt to reclaim these lands and were a continuation of the Arab-Israeli conflict. After the war, Sadat engaged in more peaceful efforts which eventually led to the Camp David Accord in 1978, where peace was brokered with Israeli Prime Minister Menachem Begin under the auspices of U.S. President Jimmy Carter. Sadly, Sadat's willingness to make peace with Israel led to his assassination in 1981.