Frederick O'Malley remembers stopping at a hotel in St. Louis while traveling on business in the 1950s.
After he registered his address and walked to his room, the phone rang.
"You've got to be kidding," the desk clerk said. "Is there actually a town called King of Prussia, Pa.?"
O'Malley assured him, "Yes, there is."
King of Prussia in those days was an obscure crossroads 19 miles northwest of Philadelphia that had taken its odd name from an 18th-century monarch.
But by 1958, with the completion of the Schuylkill Expressway to Center City, the match had been lit on a boom that would turn King of Prussia into the region's most extensively developed suburb - an edge city boasting the second-biggest mall in the United States, vast office complexes, an industrial park, even its own convention center.