louis joseph de bourbon

While the fate of France was being decided, the Dauphin Louis-Joseph was dying an agonizing death, in great physical and mental torment. On June 2, Forty Hours devotion began, and the bell of Notre Dame tolled, summoning the people to pray for the dying heir of the Bourbons.
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Marie-Antoinette, Daughter of the Caesars: Her Life, Her Times, Her Legacy - Elena Maria Vidal

Marie Antoinette with her two eldest children, Marie-Thérèse Charlotte and the Dauphin Louis Joseph, in the Petit Trianon’s gardens, by Adolf Ulrik Wertmüller