On 5 February 1328 the last Capetian king of France was laid to rest in the royal mausoleum of Saint-Denis. It is now 33 years, and more than 3,000 pages since Jonathan Sumption’s first readers followed Charles IV on his last journey, as his funeral procession wound its slow way from Notre-Dame across the Grand Pont and out through the streets of Paris into the open countryside to the north of Europe’s most populous and richest city.