House of Lilies: The Dynasty that Made Medieval France
Justine Firnhaber-Baker
Penguin, £30, 448 pages
On 12 August 1239, Louis IX of France and h is entourage intercepted some monks on the busy road between Sens and Troyes and demanded to see their cargo. The brothers handed the king a wooden box. Inside, Louis found another one made of silver, and inside that one made of gold. Nestled within this last container lay a far greater treasure still: the Crown of Thorns said to have been worn by Jesus at the Crucifixion.















