There have been more popes of this name than any other, but the last, number XXIII, was more than 40 years ago
[DOC] [TLE] A history of papal visits by U.S. presidents | PBS NewsHour [PAR] Mar 27, 2014 ... President Dwight D. Eisenhower visited Pope John XXIII at the Vatican ... Bush 
traveled to the Vatican more than any other American president.