Robert S. Wistrich, who devoted his four-decade scholarly career to dissecting anti-Semitism, from the biblical Haman, who warned King Ahasuerus of Persia against strangers whose “laws are diverse from all people,” to modern Islamist extremists who deny Israel’s right to exist, died May 19 in Rome. The Hebrew University in Jerusalem, where he taught since 1982, said he had a heart attack before a scheduled address to the Italian Senate on rising anti-Semitism in Europe. In that volume he found anti-Semitism’s historic roots in Jewish religious and social exceptionalism, which, he said, antagonized early pagans and rulers who demanded absolute fealty, and which later spread as Christians embraced the divinity of Jesus. [...] in a letter published posthumously in the Jerusalem Post, he wrote: “The Islamists are the spearhead of current anti-Semitism, aided and abetted by the moral relativism of all-too-many naive Western liberals.” The 3,500 Year Relationship of the Jewish People With the Holy Land, which was displayed at U.N.