In 1721, in order to maintain peace with Spain, the French Regent proposed to the King of Spain that the heir to the throne of France, 11-year-old Louis XV, marry 4-year-old Princess Maria of Spain. The Regent also proposed that his daughter, Miss Demonbonsier, 12, be married to the 14-year-old Prince of Asturi of Spain. Spain responded positively to the two marriages and quickly organized an exchange ceremony. The exchange of princesses will be held on a small island in the river bordering the two countries. When everything was ready, I waited for the children to show their best, but I didn't expect that all the plans were in vain.