Speyer is a charming city on the west bank of the Rhine River. Its splendid medieval core is dominated by a magnificent eleventh-century cathedral, the resting place of German emperors for three hundred years and one of Europe’s greatest expressions of Romanesque architecture. (For fans of British royalty, the future King Edward VII was introduced to his future wife, Alexandra, in the Dom zu Speyer in 1861, the matchmaker for “Bertie” being his …