New York City Landmarks Preservation Commission. In 1965, Wagner decided not to run for a fourth term as mayor. Four years later, however, he ran for mayor again, but lost the Democratic primary. In 1973, he talked with the city's five Republican county chairmen about running for Mayor as a Republican, but these negotiations collapsed. A 1993 survey of historians, political scientists and urban experts conducted by Melvin G. Holli of the University of Illinois at Chicago ranked Wagner as the seventeenth-best American big-city mayor to have served between the years 1820 and 1993. Ambassador After deciding not to run for a fourth term in 1965, Wagner served as ambassador to Spain from June 1968 to March 1969. In that year, he decided to run for a fourth term but was soundly beaten by Mario Procaccino in the Democratic primary. He also made a brief run four years later, but withdrew before the primary took place. In 1978 he was appointed by Jimmy Carter to be his representative to the Vatican, where the College of Cardinals had recently elected John Paul II. Personal life Wagner was a Roman Catholic. Wagner's first wife was Susan Edwards, by whom he had two sons, Robert Ferdinand Wagner III and Duncan. Susan Wagner died of lung cancer in 1964. By all accounts, the two had a very happy marriage, and although Susan was not particularly fond of politics, she enjoyed traveling with her husband and meeting many famous people. Susan was described as optimistic, cheerful, kind, and always happy. According to his friends, Mayor Wagner was "lonely and depressed" after the death of his first wife. He married Barbara Cavanagh in 1965. They divorced in 1971. Wagner married Phyllis Fraser, widow of Bennett Cerf, in 1975. They lived together until his death in 1991. Her five-floor townhouse at 132 East 62nd Street, designed by Denning & Fourcade, "was so magnetic that the statesman moved in." Death and legacy He died in Manhattan of heart failure in 1991, aged 80 while he was being treated for bladder cancer. His funeral mass was offered by Cardinal William Wakefield Baum at St. Patrick's Cathedral, and he was buried at Calvary Cemetery in Maspeth, Queens. "Mr. Wagner was buried beside the graves of his father, United States Senator Robert F. Wagner, and mother, Margaret, and first wife, Susan Edwards Wagner, and not far from the grave of New