When historians search for a paradigmatic figure who embodied America’s old, pre-9/11 relationship with the Arab world, an obvious candidate will be Saudi Arabia’s swaggering ambassador to Washington from 1983 to 2005, Prince Bandar bin Sultan. He was the Gatsby of foreign affairs: entertaining Washington’s elite at his mansion overlooking the Potomac; exchanging secret favors with a string of presidents from Ronald Reagan to George W. Bush; lobbying for Saudi weapons purchases so effectively that he trounced even AIPAC, the pro-Israel lobby group; operating as a deniable arm of the CIA in covert operations around the world.